Millian some of the Scottish airports can have 4-5 IFR's inbound wx blowing a gale and the cloud on the deck.
The area guys setup a sequence with the tower and seperate you vertically. Then you get transfered over to tower/app who will step you down and then clear you for the procedure when safe.
It all sounds very suspect but actually works very well when the crews know the rules and you have an experenced good procedural controller on the mike (as most of them are up North). There are various things the crew can do to help the controller out.
You can also do things which which would never be allowed in a radar enviroment like visual climb/decents againsts. Tatical rule changes while VMC on top or VFR departure followed by IFR climb once your past the inbound. And always the joker if wx permits "cancel IFR" at which point the controller can launch his 3 IFR's at the hold with unrestricted climbs without getting you on the procedure or visual.
I don't know really how it works these days under ATSOSCA