I happened to catch this on FR24....my first thoughts were that it entered holding due to a problem during or immediately after departure. First at FL060 and then further SW at FL080, as reported.
What I also noticed was that there seemed to be a hold on Gatwick departures after it had departed. The next flight out (which I think was RYR to DUB) appeared to hold at the threshold for some minutes before departing. There looked to be a couple of abandoned approaches/holding of arrivals also due to this. None of this may be related, but it might be? (speculation, but maybe a runway inspection was required)