I would only add that you ought to ask how much of your pay you would
have to contribute. That is so you can consider if you can afford it.
(It may well be good buy but it probably ain't worth starving yourself
today for the sake of a bit more jam in 2029.) When looking at the
contributions bear in mind that (i) you get tax relief on your
contributions so they cost you less than the gross amount and (ii) if
you don't join you may pay more NICs on your earnings. Your employer
may well help you with these figures.
--
R