To be honest the last thing the RN needs is extra amphib capability - we've got tonnes of it and don't use most of it in role. There is only 1 LPD active at any one time and the LSD(A) seems to be spending a lot of time doing non amphib stuff.
I'm all for getting new kit, but don't think we need to buy more amphib stuff when what we've got is perfectly good at the moment for what we need to do - the sort of funds we're talking about would go a long way to sorting the MPA replacement out.
More pertinently, have you seen the interior of a Russian warship - I suspect any RN crew assigned to these ships would mutiny very quickly. Check out photos on the state of the Kuznetzov.