Civil Servants are subject to
election purdah rules, so there are very strict limits on what work they can do, they certainly can't proceed with anything that might be seen as politically advantageous to one party. You're right to say that they don't have a month off (it's actually closer to two months) but I speak from experience to say that a lot of tedious filing gets done, certainly was when I worked n the House of Commons during election times.
The point I'm making is that the government will not be able to approve Universal's planning application before the election or even before the summer recess. There is simply not enough time for the required steps in the process (assuming it will be via Special Development Order). No amount of money, no amount of wishful thinking can change that.