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From your description, you were not at fault, and at any rate didn't think it was a particularly dangerous situation.
How do you come to that conclusion given that he apparently describes failing to give way to a vehicle coming from the right at a roundabout?
[disagrees with Oliver, cancels obligations for the rest of the day]
Brun-
At best and using the limited information I would have recorded any collision as 50/50. Just because you can squeak in front of another vehicle doesn't mean you have priority. I agree with the general principle of giving priority to the more vulnerable road user however.
To play devil's advocate, @Sharkstar, if you got so close to colliding how could you be sure you were ok to proceed before entering the roundabout? Assuming a fair margin of error that is...
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Ah, I've only just spotted an unusual complication here, which is that on the approach that Nigel used there are give-way markings, whereas the other two entries to the roundabout don't have give-way markings. Apologies, I didn't notice that earlier. I expect that it is because this kind of conflict has been experienced there before and engineers decided to add the give-way markings.
So, Nigel should have give way to the driver there, and he was at fault, but not because he has to give way to vehicles approaching from the right at a roundabout, but because of the give-way markings (which basically represent a failure of the roundabout design here). You are not obliged to give way to a vehicle coming from the right at a roundabout, but to a vehicle already in the circulatory carriageway, which obviously will be approaching from your right. This is one of the most frequently misunderstood things about roundabouts (the Highway Code's advice is simplified and doesn't explain this properly).
1.3 Roundabouts are junctions with a one-way circulatory carriageway around a central island. Vehicles on the circulatory carriageway have priority over those approaching the roundabout.
http://www.standardsforhighways.co.uk/dmrb/vol6/section2/td1607.pdf
Backstop
Oliver Schick
From your description, you were not at fault, and at any rate didn't think it was a particularly dangerous situation. Did you mean to draw the driver's position in the wrong entry lane for the manoeuvre he was about to attempt or was he in the correct (offside) lane?
I imagine that I would have waited a moment for the driver to pass if I'd seen them, even if they were in the wrong, but it's easy to say that without having been surprised by the situation.
Asymmetry in the number of entry and exit lanes is another common problem with roundabouts, but here the assumption is that the offside lane will be used only by right-turners, so that only one exit lane is needed. (It obviously doesn't always happen like that in practice.) This is the case at very many junctions. As I said earlier, the driver should have followed you (rather than using the wider space on that side to manoeuvre himself into a conflict situation).
Anyway, such innocuous incidents tell you quite a lot about junction design. Here I wonder if there are often long queues there for drivers exiting Victoria Road, and if that may have influenced his behaviour. People are sometimes terrified of having to wait.