He found three such girls in a local pub, a blonde, a brunette and a redhead.
To the blonde he said, 'I am the Prime Minister of England. Now how much would it cost me to spend some time with you?'
 
She replied, £200.'

To the brunette he asked the same question.  
 
Her reply was £100.

He then asked the redhead

Her reply was, 'Mr. Prime Minister, if you can get my skirt up as high as my taxes, my pants as low as my wages, get that thing of yours as hard as the times we are living in, and keep it rising like the price of petrol, keep me warmer than it is in my flat and screw me the way you have Pensioners, then it isn't going to cost you a bloody penny!'