Hmm. Snip from the link you provided:
It originated in 1999 in the US, on a libertarian website called Capitol Hill Blue - the giveaway is the "little over 500", the size of the US House and Senate combined - and similar variants have previously been found in Canada and India. The claims weren't true in the US and they are certainly not true in the UK.

Update: oops - I only saw this as a reply to me and answered assuming it had come from the OP. Sorry.....

>http://www.snopes.com/politics/crime/congress.asp
>http://www.guardian.co.uk/commentisfree/2006/mar/20/mpsincorruptionshocker
>
>
>>This is unbelievable, but can you imagine working for a company that has a little more than 600 employees and has the following employee statistics.
>>
>>29 have been accused of spouse abuse
>> 7 have been arrested for fraud
>> 9 have been accused of writing bad cheque's
>>17 have directly or indirectly bankrupted at least 2 businesses
>> 3 have done time for assault
>>71 cannot get a credit card due to bad credit
>>14 have been arrested on drug-related charges
>> 8 have been arrested for shoplifting
>>21 are currently defendants in lawsuits
>>84 have been arrested for drink driving in the last year
>>
>>.
>>.
>>.
>>.
>>.
>>.
>>.
>>.
>>And collectively, this year alone, they have cost the British tax payer £92,993,748 in expenses!!!
>>Which organization is this ?
>>
>>It's the 635 members of the House of Commons, the same group that cranks out hundreds of new laws each year designed to keep the rest of us inline.
>>What a bunch of bastards we have running our country - it says it all.. And just to top all that they now have the best 'corporate' pension scheme in the country!!
>>If you agree that this is an appalling state of affairs, please pass it on to everyone you know
>>
>>
>>And people say the US has problems.