For bike stuff, you could try http://www.dangeruk.co.uk for motorcross stuff otherwise there are libraries available which contain some of the standard road stuff but not full bike sets , I think Brian Hays(Imapct) might do one. Other than that I’m no help !
For fluorescent banners – try Boldscan 0800 298 38 38 I know they definitely do them in yellow and orange.
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