I've just bought a CD single of Carry on off ebay for £2.00.

It's a UK release and has the tracks 'can't ask you twice' (from the
Aus release of keeping secrets), 'own way home' and the video
for 'carry on'

It doesn't say 'promo' on it anywhere and as far as I'm aware isn't
released over here until 28th July.

Has anybody any idea what this is?

Maybe somebody has got hold of a pressing before it's official
release?