The Department of Work and Pensions has changed it's rules such that people in the UK with more than 1 wife, up to 4 I believe (iaw Islamic law) can claim £33.65 per week per wife.
However, bigamy is still illegal in the UK.
As the septics would say 'go figure'.
I know what I'd rather my contributions were spent on.... Enjoy the days activities chaps, well deserved (imho of course)