DFC
I note your comment that Northbound a/c are handed over from France to the U.K. at the same level as crossing traffic at BPK.
From ABB to BPK is 15 to 17 minutes depending on cruising TAS or G/S. This is three times as long as the time available in the German/Swiss handover and involves(or at least did in my days) two UK sectors, names now changed to numbers, but used to be Lydd and Clacton, so the Lydd sector would not have information on the BPK traffic until co-ordination was commenced between the two sectors and this would be well before the traffic left the Lydd sector. Not at all the same situation as in this tragic accident.
I hope this answers you question
