This has had me puzzled for weeks, but Frankie Stafford is actually white in normal life isn't she? She's just wearing an awful lot of fake tan?
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. If I were competing in Open competitions I would follow convention and use it (I know it matters to adjudicators) although I would make sure it washed off so that I didn't go into work next day looking like I'd escaped from the Muppets or Rainbow (or an extra on Benidorm). It looks ok on people with dark hair though, like Frankie.