Sonia ... I contacted the Association of British Insurers (ABI) in the hope of obtaining some clarification on this issue of the definition of photographic equipment, asking how two totally separate pieces of camera equipment could be constituted as one single article of photographic equipment.
Unfortunately as a trade association, they were unable to provide advice on this specific issue, as they do not have a regulatory or consumer role. However, generally speaking, they did point out that the Terms & Conditions of insurance policies, including definitions of what constitutes photographic equipment, are a commercial decision for individual insurance companies and there is no industry wide guidance on this issue. So it is therefore difficult to establish if Tesco are on their own on this particular definition of photographic equipment, or if other insurers implement the same policy.
The ABI advised that you may wish to appeal the insurance company's decision or make a formal complaint to them about it (which I understand you have already done) and failing any satisfaction, you may then wish to take it up with the Financial Ombudsman Service (which I understand you propose to do). You may already have them, but contact details are as follows:
Financial Ombudsman Service
South Quay Plaza
183 Marsh Wall
London E14 9SR
Tel: 0845 080 1800
http://www.financial-ombudsman.org.uk
I hope that Tesco may reach a sensible and amicable settlement with you to avoid you having to take this matter further.
Good luck.
David