anyhow to cut the long story short, in the UK "straight ahead" means
"track extended runway centerline" (when used in departure clearances)
or
"continue on final approach track" (when given in missed approach procedures)
(as seen in MATS part 1)
As far as I can search in my pdf copy of my Mats 1, "runway heading" is not used in the UK. Likewise, "runway track" might be used at Farnborough, but is not featured in MATS part 1
