Bloke comes home from the pub to find his wife packing a suitcase

" where the fook you going ? " He says

" i got told women get paid £400 a time in London to shag men as often as i shag you " She replies

Husband grabs a suitcase and starts packing himself

" What you doing ? " Wife asks

" Coming with you" he says , " to see how you survive on £800 a year ! "