Race Numbers

I think the time has come to replace our club road race numbers which must be at least 25 years old, have seen better days and now have a few missing. The existing numbers are doubles, does anyone know if there is a BC requirement for double numbers / two single numbers to be used in road races or is a single number sufficient? I'm sure I've done races with a single number but not sure if this is strictly allowed. Also, does anyone have any recommendations for the best place to get numbers? I've looked at Impsport but are there any decent alternatives? Also, details of suppliers for other race equipment would be useful (code of practice signs, flags, bell, lap board etc.) as I need to do a full equipment audit and replace what we need. Cheers.
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http://www.jvgraphics.co.uk/sport-event-signs/race-numbers.html
not to far from home either so possibly avoid the P and P
wouldn't get the white ones, though as they are against TT regs .
signage to
http://www.jvgraphics.co.uk/sport-event-signs/correx-race-signs.html
As it's not explicitly specified, I'd suggest CTT sizes would be OK.