If you are IFR then you are "Controlled".
You cannot, self separate or work it out yourself.
You cannot change level or move off track without clearance.
As a last resort the only thing you can if you have to move out of the way of a VFR aircraft, is declare an emergency and inform ATC of your non cleared position.
Becaus eof this, ATC will only ever have 1 IFR in the airspace at any one time.
As forcast by AsA, RPT's will have delays of unknown length.
I am glad I do not operate of have aircraft operating in this airspace!