Koka Castle
I stopped in at a local bicycle shop, but they didn't have the right size inner tube in stock to replace my spare - apparently it would have had to have been a special order.
I had meant to ask about a replacement chain too, as mine is probably a bit tired after over 2500km and it would be good not to wear out the cassette with the chain like I usually do! However, demoralised by the lack of inner-tube, I didn't.