Very underhand method of doing business. In my case, I had not realised that they would not allow me to transfer my No Claims Discount, as I was still insuring another car, whose renewal notice showed my discount level. This may be industry standard, but I am a mortal and don't work in the industry!
Anyway, after having sent off a photocopy as soon as requested, two weeks later I received a letter stating it was not acceptable proof. I called Tesco's at this stage, and they stated it was it was because it was a photocopy. So (the same day) I sent off the original renewal notice. Another two weeks passed, and I recieve another letter telling me the rule I was not aware off, and demanding another £400.
Phoning up, proved to be a wind up, as they simply said that I should have been aware of this as it is obvious on their website (it's actually hidden behind an information box). Whilst the letter was clear (to the penny) of the money they wanted, they refused to tell me how much they would refund me for cancellation, until I agreed that they were correct.
The net result, is that it has cost me £400 for 2 months insurance, and I have reverted to Direct Line, whose renewal I had sent to Tesco. This was only £50 more than Tesco were wanting and actually is cheaper than I had originally been quoted by Tesco Value car insurance.
In essence it would be a very brave person who accepts a Tescos' policy, as if they are this poor at the purchasing phase, how bad will they be if you have to claim.