for anybody that is interested as of yesterday 9th Jan 09 Doncaster removed the restriction on training flights by aircraft over 5700kg that meant you could only do a maximum of 2hr training before you had to take a 1hr break for noise abatement.
The restriction on training flights by aircraft over 5700kg now is: permitted between 0700 - 2100(L), Mon -Sat. Training on Sundays and Bank Holidays is not permitted.