I believe the point being made is that Ireland is both unable, and unwilling, to secure the safety of NATO western approaches, including transatlantic cables and airspace, and with the increasing threat, the UK should be looking at relocating resources to Northern Ireland to do the job.
(We used to have the radar site at Bishops Court, but its coverage to the west was poor due to the intervening mountains of Mourne. I imagine you could stick a remote radar head on the top of them these days).
No available west coast ports and I would have thought LM was close enough as is required for QRA.