Did the deed (mostly) last night. Recommendation was access via front
panel. access was pretty easy and one pipe was virtually blocked solid
in limescale (+fluff and 5p coin!). Apart from one screw which needed
penetrating oil to soak!

All done apart from the outer door seal to attach which needs a second
pair of hands - and will prob be somewhat tricky.. think bicycle tyre.
And of course testing .....

Other than 2 pairs of hands and soap, any recommendations for
remounting the outer seal? The clip is actually just a solid wire
(think coat hanger) attached with a very tight spring. It seems the
best bet is to slide on with clip mounted, starting at the spring
side, but it still seems very tricky