Final-drive belt for the Viceroy Under-drive lathes such as the TDS Series (TDS-5, TDS5-GB, TDS 1/1-GB, TDS 1/1, Educator, etc. as seen here http://www.lathes.co.uk/viceroy ) The best belt is the Nu-T-link, in an A Section, 1.4 metres (1400 mm) long. Price includes UK post and packing.
Other drive belts on Viceroy lathes - motor to countershaft, and the wood lathe, etc -  can be made from lengths of the same material and guarantees a perfect fit. To find the length required, just wrap a long strip of paper around the outside of the pulleys, add 50 mm to the result and order an A-section Nu-T-Link belt here