Can't get a decent replacment exhaust for your bike? Try 'Raysons UK' in Whitworth, nr Rochdale. Operated by the grandsons of the main man, Peter, at Unity Equipe, sons of Ray Hardman, Unity racer. They don'y have a webernet site yet, but they are on FannyBook:
https://www.facebook.com/RaysonsUK?fref=ts" onclick="window.open(this.href);return false;
Drop them a message and they'll be very helpful.
Had a good experience with a company/ebay seller? Found a handy website? Post a link, with a description here. Need to know where to mend wax cotton jackets? (ahem...) Spares for your Bantam? If you can't find it here, post a request.