i used tradex
but stopped when i realized my own car was also only covered for trade value and as its on hpi it needed full comp

car was worth at the time around £7000 trade value around £5-6000 sod that! plus it was only TPFT

i paid £900 for road cover up to a claim value of £10k
so i drive a £13k car crash it and its covered for NOTHING i was TPFT!
really get into the dots and i's mate it will save you a fortune if anything does happen