637 Please refer to Womble's list and EM's hints for the range A lot of recent guesses have exceeded the upper limit EDIT: and well short of the lower mark
Did turn up around the stated time. He was returning to fix my washing machine that had consistently leaked since he came and "repaired" it 2 weeks ago. He apologised for not checking the inlet valve and replaced it with another one. No charge, as it should have been.