Paul, thanks for the offer of refunding my subscription pro-rata.
But, clicking on 'sign up for plus' in the Plus forum area leads to My Modaco - subscriptions control panel, from here there dosn't appear to be a way of siging up to Plus.
Is this becase I already have a paid for subscription?
Or am I being dumb, and missing a link or button? (it is something I have reputation for - missing the bleedin' obvious