Looking south down Blackwall Reach, River Thames, from the dock gate of R.H. Green & Silley Weir's Dry Dock No. 1 in their Blackwall shiprepair yard, London. The South Eastern Gas Board works are on the opposite side of the river and Greenwich is in the centre background. A lifebuoy from the collier Dame Caroline Haslett (1950) is on the dock gate guardrail. Transparencies P63543CT to P63551CT were taken on the same occasion.