Lippitts Hill has plenty of space for the helicopters. Several times in the past it has looked after way more than the four projected at the moment .... and that is when the Boreham machjne arrives there. High point was probably three Bell 222 and three As355N but that was ages ago. Support to the Olympic fleet was brief but potentially larger in sheer numbers.
the issue may be that the two hangars have been given over to Airbus maintenance and are not fully under the control of NPAS.
Bigger issue is the neighbours. They were “assured” about the size and rate of movements and that now looks to be in danger of not being met. The possible situation there is that sorties have decayed so much that adding Boreham does not breach the assurances given.
there is no sign of any building of NPAS North Weald just yet so this “temporary” situation is not quite that at all.