I think "Visual Loose Gaggle" is the RAF's preferred FJ transit formation, always seems to work.
And how. XI Sqn (in Tornado F3 days) 'rapid' departure from Leeming (to the unpleasantness of GW1) totally blocked the old Blue One at OTR for hours. They 'scrambled' when they became serviceable.
The LATCC Supervisor was doing his nut to me over the phone, but it was 'coordinated' 'maybe'.
And I didn't use the codeword.