Flying Dodo
It'll soon be summer
Hmm. Went on to the southern website. Found the journey I want, found the bicycle space tab. Message comes up "you have already reserved a seat". Nothing about having a bike space or whether one is available on the train I want (1543 IPS to lST). Am I doing it right?
After doing the search, highlighting the price and then the train you want, click on Buy Now. The next page confirms your order. Towards the bottom, after seat preferences, there's a little arrow with bicycle space. Click on that, and then it expands to let you reserve a bike. If you then click continue, it probably leaps to the page where it asks you to say where you want to pick up your ticket. At the bottom, click on back, and it then displays what your seat reservation is and the space for 1 bicycle. It should show that first, but I've noticed at times it just leaps to the ticket delivery page.
I've just checked, and unfortunately there's no bikes spaces left on the 15:43 out of Ipswich, but there are on the 16:09 (seats currently available for £8).
In fact I simply booked a ticket from Darsham to London, rather than splitting it. It gives the warning that seat reservations aren't possible on some parts of the journey (Darsham to Ipswich), but that's not an issue.