Dr. Howard and Dr. Arnold are private Consultant Cardiologists practising in central London at OneWelbeck (Marylebone) and Hammersmith Hospital, and Senior Academics at Imperial College London.
They combine cutting-edge research with compassionate patient care, and are internationally recognised experts in cardiac diagnostics, risk reduction and treatments.
Book a Consultation
From chest pain and palpitations to atrial fibrillation and heart failure, our private cardiology clinic in central London provides expert assessment and treatment for the full range of adult cardiac conditions.
Expert diagnosis and management of cardiac-related chest pain.
Comprehensive assessment of cardiac causes of shortness of breath.
Specialised care for irregular heartbeats and rhythm disorders.
Thorough evaluation of cardiac-related syncope and pre-syncope.
Standard electrocardiogram for heart rhythm and electrical activity assessment.
Monitored cardiac testing during physical activity to evaluate heart function under stress.
CT imaging to assess the coronary arteries and identify plaque or blockages.
Non-invasive scan to quantify coronary calcium and refine cardiac risk assessment.
Ultrasound imaging of the heart to assess structure and function.
Advanced lipid profiling and cardiovascular risk assessment.
Continuous monitoring to detect variations in blood pressure throughout daily activities.
Detailed magnetic resonance imaging of the heart for comprehensive structural assessment.
Holter monitoring and patches for continuous heart rhythm recording.
CPET for detailed assessment of heart and lung function during exercise.
Surgical placement of devices to regulate heart rhythm.
Minimally invasive procedure to correct irregular heart rhythms.
Consultant Cardiologist · GMC 7080262
Internationally recognised expert in cardiac imaging and diagnostics
Learn More
Consultant Cardiologist · GMC 7088269
Renowned academic cardiologist specialising in rhythm disorders of the heart
Learn MoreOur team specialises in a comprehensive range of cardiac conditions and offers advanced diagnostic and treatment services. See what we treat or explore our expertise below.
Dr. Howard provides expert care for a range of conditions, including:
He performs a variety of investigations and treatments, such as:
Dr. Howard's groundbreaking contributions to cardiac imaging include developing AI-driven MRI protocols that enable faster and more accurate diagnoses, and his expertise has been instrumental in multiple high-profile clinical trials.
Dr Ahran Arnold is an expert in the following conditions:
He is also an expert in the following tests and treatments:
Dr James Howard is a Consultant Cardiologist and Clinical Academic who believes the best care combines technical excellence with patient-centred decision making. He treats patients at OneWelbeck, Hammersmith and Charing Cross Hospital.
He studied Clinical Medicine at Trinity College, the University of Cambridge, and completed a BA in Natural Sciences. His academic training includes an NIHR Academic Clinical Fellowship, Wellcome Trust Clinical Research Training Fellowship, an NIHR Clinical Lectureship and a BHF Intermediate Clinical Research Fellowship, alongside postgraduate qualifications in Clinical Trials at the London School of Hygiene and Tropical Medicine. He has secured over £1 million in research funding.
He led the SAMSON trial in the New England Journal of Medicine, which clarified statin side effects and how to support patients who struggle with treatment. He also develops AI software for cardiac MRI to make scans faster and more accurate, work recognised with a global prize from Facebook and Microsoft.
Dr Ahran Arnold is a Consultant Cardiologist specialising in electrophysiology and devices at OneWelbeck and Hammersmith Hospital. He carries out arrhythmia procedures including ablation and device implantation and assesses patients with symptoms or test results potentially caused by heart conditions and heart rhythm disorders. He is a Senior Lecturer in Cardiology at the National Heart and Lung Institute, Imperial College London where he runs a clinical research programme that focuses on rhythm management, wearables and machine learning for cardiac conditions.
We practice at OneWelbeck and Hammersmith Hospital, providing world-class cardiac care in state-of-the-art facilities.
Book an Appointment5.0 average from 12 verified patient reviews on Doctify.
I had an exceptional experience with Dr Howard and cannot recommend him highly enough. The cardiac MRI was conducted efficiently, but what truly set this experience apart was the time and care taken afterwards to explain the results — clearly, systematically, and in a way that was both thorough and easy to understand. I left feeling fully informed and reassured about my future care.
I have now seen Dr James Howard three times. I am very grateful as he has got my blood pressure under control which previous doctors have really struggled with. I feel so much better.
I was so nervous about my heart issues but Dr. Howard was just so kind, he really listened to me which made a huge difference. He explained everything about my palpitations so I actually understood.
I saw Doctor Howard about the chest pains I've been suffering and he arranged tests quickly that got to the bottom of it.
A 5 star consultation. Dr Howard put me at ease and explained everything very clearly and concisely. Encouraged me to express my views and concerns.
I saw Doctor Howard for blood pressure. I've had lots of side effects in the past and it was nice to hear someone take time to get to the bottom of it all. He was very patient and we've found something that works for me.
We are recognised by all major UK private medical insurers, including Aviva, AXA Health, Bupa, Vitality, WPA, Allianz, Cigna, Healix and Henner. Self-pay patients are equally welcome.
We see patients at three central London locations:
Dr. Howard publishes regular bookable clinic slots directly on his OneWelbeck profile. Outside those slots we can usually arrange a consultation within a few days to fit around your availability — just call or email and we'll find a time that works.
We assess and manage the full range of adult cardiac problems including chest pain and angina, breathlessness, palpitations, dizziness and collapses, atrial fibrillation and other rhythm disorders, high blood pressure, high cholesterol, heart failure and cardiovascular risk reduction.
Diagnostic services include ECG, exercise ECG, echocardiography, cardiac MRI, CT coronary angiography, coronary calcium scoring, 24-hour ECG and blood pressure monitoring, and cardiopulmonary exercise testing. Treatments include catheter ablation for arrhythmias, pacemaker and defibrillator implantation, cardiac resynchronisation therapy and implantable loop recorders.
Most private insurers require a GP referral before they will authorise a consultation, so it is worth checking with your insurer first. Self-pay patients are welcome to book without a referral, although a referral letter is helpful where available.
Appointments for Dr. James Howard and Dr. Arnold can be booked via phone or email.