Compulsory overtime is a fact of life on parts of the railway. London Midland introduced it to the West Mids franchise in 2011-2012 after several Sundays had mass cancellations due to lack of traincrew.
As a result all new hires were on "contracted Sundays" which meant you had to work rostered Sundays but got 1.5x pay for them (plus any fluctuations and extras).
However, administering the rostered Sundays was, to a degree, left to depots. One depot used to include the Sundays on the weekly overtime request sheet and ran it on a prioritising system which meant that if it was your -contracted- Sunday as per roster sheet but you didnt want to work it, often you got out of it (but didnt get paid) as there were volunteers galore. Another depots LLC however put their feet up and did nothing, ensuring a rather unbalanced situation where 40% of the link did 100% of the Sundays as all the old boys didnt have to do anything, and there were no easy provisions for volunteers.
It sounds like TOCs that already have this "committed Sundays" provision will be left alone and the Ts and Cs on this particular issue will not be touched.
As a result all new hires were on "contracted Sundays" which meant you had to work rostered Sundays but got 1.5x pay for them (plus any fluctuations and extras).
However, administering the rostered Sundays was, to a degree, left to depots. One depot used to include the Sundays on the weekly overtime request sheet and ran it on a prioritising system which meant that if it was your -contracted- Sunday as per roster sheet but you didnt want to work it, often you got out of it (but didnt get paid) as there were volunteers galore. Another depots LLC however put their feet up and did nothing, ensuring a rather unbalanced situation where 40% of the link did 100% of the Sundays as all the old boys didnt have to do anything, and there were no easy provisions for volunteers.
It sounds like TOCs that already have this "committed Sundays" provision will be left alone and the Ts and Cs on this particular issue will not be touched.