May be able to help here…..
I have a set of Roval Traversees, and some Flows onto CK hubs built with DT Supercomp spokes. Respective weights are 1580g vs 1790g. Hope hubs are about 30g lighter than CK's. Note these weights are based on a nerdy spreadsheet I built rather than on the scales!! Both are run tubeless.
Out riding, the Rovals are noticably lighter, and quicker to spin up to speed. For such a light wheel, with a low spoke count, they are also pretty stiff.
I weigh 12.5st and the Rovals are on a Titus Motolite which is built up for lightweight all-mountain duty. As such, the wheels have been used in the Lakes, Scotland, do 4-5' jumps, and on one occaision the rear was cased on a ditch that I felt sure would have destroyed it – it didn't budge! The front one needed retruing after I put my foot into it in a rather bizarre slow-speed crash, but that's been about it in the 18 months or so I've owned them.
The CK/Flows are on a 456, and get used for local thrashes, inc 4-5' drops etc. They are stiff and reliable, and the Flow gives a great profile to something like a 2.2 – 2.3" tyre.
Overall I'd say you are light enough to get away with the Roval for pretty much any riding you'd do in the UK. I'd have no problems getting another pair.
BTW I'm based nr Godalming if you wanted to compare the two.