Thought I'd give you an update - after your comments, I thought 'ah, sod it - I'll try converting it myself'.
Bought single speed rear wheel off Ebay (from Shacklewell Components), 135mm - put it on bike - presto, working.
Can't believe it was that simple, or that both (local, non-chain, friendly and would love to trust) bike shops near me either lied, or knew so little about single-speed that they misled me.
Thanks for the advice, glad I persisted, sorry to those who tried to buy it from me once I'd changed my mind!
Thought I'd give you an update - after your comments, I thought 'ah, sod it - I'll try converting it myself'.
Bought single speed rear wheel off Ebay (from Shacklewell Components), 135mm - put it on bike - presto, working.
Can't believe it was that simple, or that both (local, non-chain, friendly and would love to trust) bike shops near me either lied, or knew so little about single-speed that they misled me.
Thanks for the advice, glad I persisted, sorry to those who tried to buy it from me once I'd changed my mind!