Hey guys. Thanks to those who offered opinions earlier. Just to update, I have the watch on my wrist now.
Firstly, I took a good look at the dial under a loupe and it is clear that the original radium lume has been scraped off and just the underlying paint left behind.
Secondly, I believe the hands to be replacement hands. I asked the seller if the hands were ever replaced and he said no, but the watch was his dad's and I wouldn't be surprised if he was mistaken.
I took it to a local watchmaker to inspect and he called me back a week later to say he'd serviced the movement already. He replaced the escape wheel, which had a broken pivot and that was why it probably stopped running.
I then set about ordering a new crystal (the one fitted wasn't an Omega signed crystal), crown (the gasket in the one on it was shot and it probably wasn't original anyway), caseback gasket and case clamp screw. I couldn't get the correct case clamp to replace the missing one, so fashioned one myself. I'll keep looking for the correct Omega one (265-1911 if anyone has one).
The parts arrived a couple of days ago and I have now fitted them.
While I had it open I tweaked the regulation and got the following result.
While it's not "all original" I think you'll agree it's quite a nice little watch.
If anyone has the correct broad arrow handset or has a lead on one I'd love to hear about it.
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