OK guys, more information. I spoke to a very nice lady called Val at Talon today (anyone's name who starts with a 'V' is great in my book!).
I have now paid for my black rear sprocket and it will be on it's way to me. They also have front sprockets. They had 3 in stock, so I nabbed one. The front sprocket part number is TG62052518, £20.84 plus the dreaded (this being shorted for the dreaded VAT@20% for our non-blighty members). Tell Val I sent ya and she said she would honor this price. They will happily ship anywhere. Even the US. They would entertain making a further batch, but would need a 25-30 unit commitment.
You can contact the lovely and very helpful val on:
+44 (0) 1935 471508
enquiries@talon-eng.co.uk
Hope that helps!