So far as I can work out, pension administrators operate to quite simple rules:
(1) Provision of any form of information will cost at least an arm and a leg, probably several arms, a leg and a couple of internal organs. They will probably disclose their own telephone number for about £300. If you want them to do something drastic, like tell you how much your pension is currently worth, it'll cost even more. If you do something stupid like get divorced, and need to know what the pension is likely to be worth, you're talking thousands. Yes, there's a function in Excel that will do the maths, but someone's still got to type it in...
(2) In the first instance, all information sent will be not what you asked for
(3) And even the simplest enquiries will take two to three weeks. Again, if you're considering getting divorced, then by the time they've worked out how to advise your lawyer on the size of your pension pot, you will probably have remarried, had three kids, got one of them to University, and got divorced again.
(4) When they do send the information you ask for, it will be wrong.
(5) But there will be a complicated disclaimer explaining why no one is allowed to assume it's right...
(6)... unless you pay them again for an enhanced reply where they promise that the data might be right.
Good luck! Basically, in any scenario where you're working to a deadline, it is completely impossible to get the correct data in time.