My bus got to supermarket last night... but required assistance to leave.

Breakdown guy said battery fine, put a powerpack on which made no difference, said most probably starter solenoid. She bump started no problem. From her history she had a new starter (refurb) fitted about 2 years ago. Looking at it (think i am looking at right thing over the back right hand side, the connection looks very corroded (it was in the dark, it was very late... and cold... sniff).
I am currently in lewisham in need of a vw friendly garage.
Does anyone have any ideas. I am not technically minded, I have ordered a Haynes manual, van is in very regular use.
Simon