OK. So it's a bit premature but I actually saw a bargain (or what I thought was anyway) and went and splashed out on a 4-frame stainless steel manual extractor. Not an electric one, as really I don't have enough need for that, and besides I thought the exercise would be good for me!
It's now stashed in the shed waiting for an opportunity to extract.
Next job is to remove a couple of supers, if I can, to reduce the boxes on the hives over winter - then some mite management in a couple of months - oxalic acid crystals vaporized in the hive in late December...
Dave and I may even move the hives to a new location in the winter.
Lots to do and consider even now!