hmm Skyborne are one of the more expensive schools. I've heard great things about Blackbushe, Stapleford, VA and ACS (provided you strictly want to stay within the UK). Just stick to as few schools as you can. BA will take modular students in so long as they've studied at 3 or less different schools so keep that in mind.
You're missing the PPL, night rating, ATPL theory and hour buildling, which adds up. Rudestuff (check out his prveious posts because he knows about this stuff) says it's cheapest to do your PPL, night rating, IRR, CBIR, MEP, CPL, [APS] MCC. Somewhere between there, account for your ATPL theory, UPRT and any hour buildling needed to get to the next course, depending on flight school. I would think about paying any extra exam fees for the EASA license too for more graduate options.