Whilst I find the though of claiming compensation from a spouse unpleasant, lets just imagine he is a self employed builder and his wife doesn't work.
I totally hate false insurance claims and it is true that this is the reason we all pay too much for insurance (until we need it that is)
The OP was injured, if he is unable to work for 6 weeks or so this could have a major impact on his familys earnings, many places now only pay SSP.
You need to consider personal circumstances and only the OP can decide.
Morality has nothing to do with it, insurance is a waste of money right up to the point that you need it, it then suddenly becomes the best money you have ever spent.