I knew I should have checked if this thread was already running before I posted ------
The Express have got hold of this in all its detail -
British Airways plane declares EMERGENCY minutes after take off | UK | News | Express.co.uk
I was actually enjoying my lunch outside The Rising Sun when G-VIIH lifted off 27L and I heard 3 or 4 loud bangs followed by a belch of flame from Eng No 2, gear remained down and she stayed at 2000ft before climbing to 6000ft and heading out East to presumably dump some juice, landed back on 27R safely around 25 mins later.