Don't bother with a sim session and a multi trip. You'll need to pay two examiner fees , one for each trip, nver mind the pain of sitting next to an examiner twice. Just get in the plane and do it all in one go . My last one took an hour to do the lot and cost £500 for the exmainer fee, aproaches and an hour in the aircraft. I think passing the LPC will also count as the hour with an instructor to get the SEP signed off.
So go for SEP, MEP IR_SPA-ME and IMC all in on trip and for one examiner fee.
PM me if you want a couple of non school based contacts in the gloucestershire area.