Hi giles. Yes I agree re the TR1 but as far as I know that process takes a few days (again don't quote me - I've never filed one). By authority I mean that my broker spoke to the market maker charged with selling the stock and that was the story - so take it or leave it but what he was told is that fire sale was nothing to with ALGW it was cover for losses in other positions.
I have it on authority that the 15m sale was for someone trading t20s who couldnt cover. His custodian told him to pay or they were going to sell stock and he couldn’t pay. It was not a considered disposal they just wanted £500k in cash.