Thought i would play by the rules and let the insurers know.
Phoned Bennetts and guess what?
Not bothered about the cans but the underwriters were not happy about the bellypan and refused to accept it.

I can't understand it,a bellypan is cosmetic not performance enhancing

This now means i ;
1, don't fit the bellypan

or
2, change the underwriters at an admin cost of £30

or
3, cancel my policy and pay an early cancellation fee of £30

or
4, fit the bellypan, b**locks to them and only tell them when the policy is up for renewal in June

Hmmnn, tricky one, that'll be option 4 for me then
