Final Update:
I returned 2 TT Start units to TomTom.

A 2 Gig unit is on its way back to me, 'repaired' free of charge.
The other 1 Gig unit (which had the identical fault) has been replaced at a cost of 75 Euro (or about 51 UK Pounds)

Both of them will have a TomTom 6 month gaurantee.

Morel of the story - Don't buy a faulty unit off Ebay <grin!>

Bob.