It`s HMRC (everyone favourite`s department !

There was a need for reform as anyone who started working after 2005 had a far worse & restrictive contract than I did ( I joined in 1988).
They did a survey and realised that they did have enough staff who were obliged to answer the phones after 3pm and so could not provide effective customer service and I was very much in the minority with my contract.
So my Union (PCS) negotiated with management and a business case was put to the Treasury to ask if we could be offered a revised package of T&C`s and the Treasury said yes.
My revised T&C`s mean that
1) I can`t start work on Flexi before 07:45 (used to be 07:00) and if rostered to start at 07:45 or work until 17:00 I have to be there (unless I can swop with a colleague)
2) I have to work until 17:00 one night a week and work 6 Saturday`s a year (if there is a business demand)
3) I lost 1 1/2 days Privilege Leave a year ( 1 day at Christmas and 1/2 day Maundy Thursday ) these were extra holiday`s given to Civil Servants
4) I gained a 7% consolidated pay rise (paid over 2 years) and 6% in 3 non consolidated lump sums - which is a bonus to me as I am hoping to partially retire when I am 60 ( in 5 years time) and this will boost my pension !.
The PCS vote for this was 80% yes 20% no, (I voted YES) most probably because
1) Management encouraged everyone to join the Union so they could vote , because of collective bargaining
https://www.tuc.org.uk/workplace-guidance/organising-and-bargaining/collective-bargaining
and those who had joined after 2005 realised that this was the best way to get rid of their old contract and get themselves a payrise !.