So I made a plan. Fail to plan, plan to fail eh? 
I would install all new rads and remove all the old lead pipe. I needed a plumber in to move a gas pipe anyway but if I did the rest it'd be cheaper. I've done central heating changes of rads before.
Electrics - need more sockets in every room, so I would chisel out for those and install back boxes ready for electrician
Repair some roof tiles
Replace windows and doors.
Biggest job was the removal of the wall between the dining room and kitchen, the one with the rad on in the pics above. I wasn't prepared for how hard this would be. First of all to prepare for the kitchen going in I had to remove all the black lime plaster from the kitchen, remove the ceiling and the rads attached to the wall to be removed. It took most of a day to remove the existing kitchen with a friend as it was installed almost as part of the building, with wedges into the brickwork to screw the unit sections into.
Also the cost was mounting. To get permission from the leaseholder I had to pay £400, £300 for structural calcs and £200 for building control. So £900 in and nothing had changed yet!