There are three key resources for Singer 4AD spares

Bill Haverly (his MASCOT articles are extensively reproduced on this site) holds ASCO spares, plus a collection of used, new-old and remanufactured Roadster parts. His spares list, as of January 2009 is reproduced here and includes his contact details. See also his article and listing in MASCOT September/October 2009 issue.

Arthur Michell has become the new home for the Singer Owner's Club spares. His first list and contact details can be found here

Andrew McAdam stock spares for a wide range of Singers including Roadsters and can be contacted at Macs Factors (tel: 01553 841252 or email: macs.factors@ntlworld.com.)

Mascot published a very useful Directory of ASCO Website Commercial Links in 2006. This lists many sources for spares, specialist repairs, and manufacture, also insurance, books and other publications, transport, tools and other services.

More general spares

Lucas electrical parts catalog - include 4AD
http://www3.bc.sympatico.ca/car/lucas.pdf

Namrick Mail Order Supplies to Automotive Restorers and Kit Car Builders - nuts, bolts, screws, brake parts, tools, taps and dies, drills, fasteners etc - nice online ordering capability.
http://www.namrick.co.uk

Spares and other paraphernalia - general site
http://www.holden.co.uk/

UK source for Antique Tyres, Classic Tyres, Vintage Tyres
http://www.northhantstyre.co.uk

Castrol Classic Oils site
Oils, greases and other fluids for classic cars
http://www.castrolclassicoils.co.uk/