Doesn't anyone know when the Priority Pass lounge (i.e. the 'other' Escape Lounge) in T3 is open as I believe it's seasonal opening?

Travelled out of T3 with BA in J the other Saturday early and it was rammed. Flying out with Ryanair in a few weeks on a Saturday at the same time and don't fancy my chances armed only with my PP card.

It does look like it can be reserved for £6 each, however if the PP Escape Lounge is open I've never seen that busy. It's a party of 4.

Thanks!