Thanks to everyone for their help on my cylinder queries last week,
much obliged. Am now halfway through redoing everything in airing
cupboard (halfway meaning having removed everything but not put
anything in yet) and was starting to plan the wiring.

New setup is Danfoss 2x2port all-in-one pack. It's got a nice neat
wiring box and instructions as to how to wire it. No problem. Old setup
was a standard 1-gang surface mount box on the wall, with a rat's nest
of cables connected together with loose connection blocks. I've been
deciphering the old one and checking it matches the new one; seems to
be the same, apart from a couple of things.

Instructions for new one shows switched live from boiler connected to
pump live and to Aux Sw Out (orange?) for both valves. Old setup seems
to have two separate switched live cables, one connected to the pump
live and the other to the valves. Does this mean I have pump overrun?
NB if that sounds like I know what I'm talking about, it's only because
the instructions say 'Refer to Boiler wiring information for boilers
with pump overrun' (which of course I don't have, inherited the boiler
(Potterton Profile 50e) with house).

If that's the case, presumably I should preserve this split between the
pump and the valves? That seems fairly straightforward, would there be
any other changes I'd have to to make?

One other thing - the whole setup seems to be powered via the cable
from the boiler (via a permanent live), there is no direct mains into
the wiring box. Is this OK to do? There is a spare outlet in the
cupboard which is currently unused (maybe originally for a second
immersion?) so I could power everything from there if that's preferable
- in which case presumably leave the perm live from boiler unconnected?

Hope that all makes sense and thanks in advance for any help!