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Thanks.
//You will probably have to declare any interest element included in the compensation//
Tricky one this I think, as the total loss the FSCS has calculated was £63k but the compensation is limited to £50k. I need to check the paperwork again, but I believe there was a small element of interest within that £63k (£400 ish) so I don't know how HMRC would then calculate the interest part on the reduced amount of £50k coming to me. Also I have to pay 15% + VAT to the law firm so I won't get the full £50k.
(The reason I said I was fully compensated as I actually only invested £36k but the pension fund my money was in had done so well since I took my money out that that the FSCS said my pension fund value would have been £63k if I'd have left the money where it was).