And I am not sure his aircraft is certified for VFR on top (although I think the UK rule on that is silly).
At his reported altitude which I think was 5500 feet, he certainly had more than 5k vis and almost certainly more than 1500 metres horizontally and 1000ft vertically from Cloud. I am not sure what an aircraft certified for VFR on top is, or more relevant, whether there are any special microlight licence VFR limitations.
The only thing I found unbelievable is that the weather is ever as nice as that in Scotland....