Personally I’d store you are with upgrades, unless you want to spend a little more and get a tt frame, something like an old p2 should be all you ever need (I did a 51min 25 on them and I’m very average) and you might get lucky and pick one up for £3-500…
I’m not really arsed for upgrades, and I’ve no space for a dedicated TT bike. A set of race wheels and sorting the cockpit out maybe. But I’ve got 6 months until I can do another 25 - so I’m not in a hurry to spend any cash!
I'm going to finally retire my P2 for next season in lieu of something a bit more fun to ride. It is pretty decent in a straight line if DC's and PB's are the priority (not for me)..
Personally I’d store you are with upgrades, unless you want to spend a little more and get a tt frame, something like an old p2 should be all you ever need (I did a 51min 25 on them and I’m very average) and you might get lucky and pick one up for £3-500…