Nope not a HWY one, probably G-OJSA, looking like the twin sister of G-JURA which is in fine fettle and serving the Western Isles. The other ones are likely to have been G-CCPW and G-JXTA. Google them for more info.
As I have previously posted in another forum they are all third party a/c in for storage/maintenance or a combination of both.
Incidently JURA is due to have a makeover soon and will come out of the shed in the HWY green/black and white scheme.
Cheers.
CRX