I finally got around to stripping it down today, and all pulleys are tight and in situ.
(The RAC man who brought me home half removed the timing cover and reckoned that the lower pulley had shifted. It hasn't). The belt tensioner however was spinning but was seized against the block. I reckoned I must have overtightened it with the 40 year old torque wrench my Dad let me borrow. Then I suppose as the belt stretched it began to lose tension.
A cambelt and tensioner will be with me tomorrow (and I've ordered a new torque wrench as well!).
Cheers,
Chris
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