Err if you have 150 hours there is no point doing a Intergrated course.
If doing a modular course you don't need a valid sep OR mep to do any of the training becuase its all dual.
I would contact bristol or oat or any other ground school provider and get going with the ground school. Then before you start cpl or IR training do a few hours with a PPL instructor preferably with one at the school your doing the course with. The CPL done in a complex single will get your SEP back or in the twin MEP. And if after cpl and IR done on the twin you still want your SEP back there will be someone at the school able to do a quick SEP test for you.
I notice your in Leeds. Pop into Leeds flying school and I am sure dylan can point you in the right direction
MJ