Tina, has your boyfriend had a fault claim since his last renewal, it could be that the policy is being cancelled on a no-return basis.
Other than that, i agree with the rest of the guys on here, that £200 does seem quite high for a cancellation fee.
Some companies will charge a flat rate for cancelling, others will charge a months premium.
Also if he has legal cover then there's not normally a refund given for that and also if he has breakdown cover then there's probably as cancellation charge for that or, if he's used it, that could also be cancelled no-return.
If you post back with more info i.e the insurer, how he pays for the policy (presumably its
direct debit) and roughly how much he pays (then we might be able to calculate what the charge should roughly be) then we should be able to help further.
In regards to money grabber, i would guess that your policy was probably cancelled for non-payment and the outstanding balance is probably for the time you had on cover that you didn't pay for.
DA