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I could probably do it depending on which scheme and exactly what you want but I have access to most distros and schemes. Can build them up for you too but if you've got a person you like that's cool too, only problem would be my complete lack of cashflow after an appallingly slow winter, so you'd need to pay upfront to cover trade costs and I can refund that once the voucher pays out. Otherwise cycleschemes usually have a dealer section on their websites so look on that and pick one that's close or does most of the bits you'd need or both.
Can your mechanic (GC) do cycle scheme? Get all the bits through them.