Ives I think the cheapest you will find is a Stronglight 55, which is a one-piece crank and chain ring for 25 quid from Biddle Bikes: http://biddlebikes.co.uk/catalog/product_info.php?products_id=59
If you want to spend a little more, get the a FSA Vero chain set which has a removable chain ring for 40 quid from Kiwi Cycles: http://www.kiwicycles.com/partsce.htm
@okwithmydecay started
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Ives I think the cheapest you will find is a Stronglight 55, which is a one-piece crank and chain ring for 25 quid from Biddle Bikes: http://biddlebikes.co.uk/catalog/product_info.php?products_id=59
If you want to spend a little more, get the a FSA Vero chain set which has a removable chain ring for 40 quid from Kiwi Cycles: http://www.kiwicycles.com/partsce.htm