The problem is though, you can have a car with £2500 for example, you insure it fully comp at great expense, crash it, claim from your insurance and your premium sky rockets the following year.
If you insure it TPFT, not only do you save on the huge excess if you crash it (unless of course you hit someone else, but most crashes in the first few years of driving don't involve any other vehicle). You save money on the premium and the following year the insurance company knows nothing about your bump so the premium halfs rather than doubles. On a car worth £2.5k I reckon it works out cheaper in the first few years of driving to go TPFT.