Can I be paid for two full time jobs at the same time?

[Pharoah]

Please can anyone offer any advice:

I am currently working out my notice period (3 months) for my current job which finishes on 1st May 2008. I am on 'gardening leave' and being paid to be at home and do nothing which is nice and is giving me lots of time to give the Sagaris a spring clean! I am not required to attend the office and they have taken all my IT / phone etc away from me so it really is all finished from a work point of view.

The question is, I have now found / been offered another job (at a different company) and they want me to start on the 1st of April (a month before my 'gardening leave is up). Is there anyway my old employer could / is likely to find out that I have started a new job before my old one officially ends? I guess I will not have a P45 for the new company - is this a problem? I assume this might have implications for tax codes etc for PAYE. It would be great if I could get 2 pay cheques for one month...

Any advice gratefully received....

[Pharoah]

Thanks guys - will check my contract re the 'can / can't work for anyone else clause' if there is one as I guess that is quite key.