The size is on Ebay, only £250 there
http://www.ebay.co.uk/itm/54CM-RALEIGH-REYNOLDS-531-SUPER-COMPACT-GEOMETRY-SINGLE-SPEED-/161742090880?pt=LH_DefaultDomain_3&hash=item25a8947280
@DoubtfulAce started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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The size is on Ebay, only £250 there
http://www.ebay.co.uk/itm/54CM-RALEIGH-REYNOLDS-531-SUPER-COMPACT-GEOMETRY-SINGLE-SPEED-/161742090880?pt=LH_DefaultDomain_3&hash=item25a8947280