Good luck with this mate. I have had nothing but issues with them over the years and it is only this year I decided enough was enough and removed them off of taking payment through PAYE and now give them £350 a month DD instead which means ill be done come December, even doing this was a nightmare and for moths they were taking both the DD and the money from my salary.
All in all they are easy to deal with but difficult when trying to get things done. Even still I wouldn't be trying to pull the wool over their eyes as others have suggested. They have more power than you may give them credit for, give them everything they need and make the arrangements to pay them their money. For what it's worth they asked for similar from me last year and I was just completing on a property and had almost £50k sitting there.
All in all they are easy to deal with but difficult when trying to get things done. Even still I wouldn't be trying to pull the wool over their eyes as others have suggested. They have more power than you may give them credit for, give them everything they need and make the arrangements to pay them their money. For what it's worth they asked for similar from me last year and I was just completing on a property and had almost £50k sitting there.