Completely agree with you. Volume dropped off notably on 17th of Jan, when all fund managers were back. This is notable as the weeks before then should have been much lower volume than that period due to holidays. On market action has just looked like retail and ETF flows.
I reckon there's a very good chance someone has been in serious talks with Sky and major holders trying to agree on a price from 17th of Jan. If this is the case then any announcement would be imminent (and certainly before results).
Note: this is my own opinion and is pure speculation. It should not be considered any reason to buy, hold or sell.