Have a look on the Honda UK website
Honda (UK) - Cars - Owner - Parts And Servicing - Fixed Priced Servicing
fixed price servicing/terms & conditions. Section 9 cancellation - Says "This agreement may be cancelled by or on behalf of the customer on the vehicle being declared by an insurance company to be a total loss as a result of accidental damage then read 9.16 if you paid for the 5 year package you should be reinbursed from what it says