Thanks for the advice Hanzel! I had a quick look earlier in the week and it seemed simple enough after the belt cover was removed, so I carried on and did it. The tensioner wheel is spring-loaded, so it was a simple job of loosening the centre bolt, levering it away from the belt, and retightening it. The belt was still a bit tight but the old one came off OK and the new one went on fine. Loosen the bolt on the tensioner wheel again and it springs back into position.
The only problem I had was the usual hassle of undoing the crank pulley bolt, which was only really accessible when I had removed the engine mounting and inner wing splash shield, and lowered the engine unit below the edge of the inner wing. The I found that just putting the car in gear with the brakes on wouldn't give me enough resistance to crack the pulley bolt undone, so I tried an old trick that I used ages ago: remove no.1 spark plug, turn the engine just past tdc on the firing stroke, feed in some hard rubber cable, and rotate the engine backwards so the piston compresses the rubber cable against the head and locks it up completely. Obviously this has to be done quite carefully, and it's vital it's on the firing stroke (I checked the rotor position in the distributor) or it could bend the valves if it was on the exhaust/intake stroke.
Runs perfectly after the work, so I guess the timing must be pretty much OK!
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