I used to play this instrument as a student in Leeds about 16 years ago; St Mark's had just been re-opened, after a period of closure made necessary by the occasional chunk of falling masonry. Gorgeous instrument in a lovely church/acoustic.
I also used to deputize at All Souls. Here, it was told that the organ had been used by A&S as a 'demonstration' instrument, thanks to it's close proximity to the A&S factory. The pipework of the Great mixture had been removed, apparently when the lady donor had left the parish in a fit of pique! Another glorious building with a small but dedicated community, which had just been re-founded as a 'plant' from St Michael, Headingley, following some serious difficulties.
My 'everyday' practice instrument was at St Augustine, Wrangthorn. Another beautifully voiced A&S of great character - and a versatility not obvious from its spec - though in poor shape.
Cheers,
G