Whats wrong with this picture

Just called an agency in London to enquire about a job being advertised. One of the positions is in Charlton and this is the pay rate - up to 39hrs £11.25ph, 40+hrs £10.25ph. Now whats wrong with this picture, surely working overtime should be paid either the same or slightly more. I told the girl that I'd have to pass on this. The jobs are being advertised by Milestoneops, unless they rethink their rate policy this is one driver who will not be working for them.