A Mirage F1 det to Marham last year was responsible for a slew of false 'Jag' sightings; from some angles you can't see the 1 vs 2 jetpipe difference and the silhouette is quite similar. Could our French brethren be taking early advantage of the new defence accord to use the UKLFS? Although why they would be in formation with a Harrier somewhat escapes me (affil perhaps?)