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There are free sites but then there is no guarantee if it goes pear shaped.
Had a look there are freebie sites that do check if stolen and if written off. Might be worthwhile to find the location of all the VIN numbers on the shell and see if they match. Might be worth while to see if a cheap OBD reader can check that the electronic VIN match.
EDIT: isitnicked.com is free I think, totalcarcheck is £2.
What's the forum approved site for checking write off/finance/stolen etc when buying 2nd hand? Free would be nice but in guessing that's not a thing.