Indeed it was called the Bath Tub. During my time there the main diving area was still intact with rain water in it (around 6 ft of it) Many additional store rooms were build on and around the sun decks. My packing material stores were in a building right above the water. The main entrance housed a museum room of Eddystone Radios and initially the Personnel Office with a door leading to the buying office to the right and a door to the main factory dirctly in front as you entered. throught that and turn left to Tool Room, Die Cast Boxes, Spray Shop and Dispatch. then onto Printed Circuit Assembly.
Turn right to go past Machine Shop Main Stores, Test then onto Main Assembly. Happy days. would be great if anybody has photos of the inside.