Britain's FTSE drifts lower, eyes on BoE's "Super Thursday"
* FTSE 100 down 0.3 pct * Equities under pressure as sterling strengthens * Miners hit as copper sinks to 6 year low * RSA falls, with focus on prospect of Zurich bid (Recasts) By Alistair Smout and Liisa Tuhkanen LONDON, Aug 6 (Reuters) - Britain's top share index
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