There are a ton of British brands with Reynolds tubing, but many(most) have disc brakes.

There is a 725 bike available in full builds for dirt cheap. https://www.ribblecycles.co.uk/ribble-endurance-725/
The cool think about Ribble's bikes is you can create totally custom paint schemes for $320 extra. And the full build costs are so low, you could swap out stuff that you specifically want after the fact and still come in cheaper than a lot of other options.
The disc version weighs 2100g and fork weighs 470g. So the rim brake versions probably weigh 2050g and 400g or something like that- slightly less, but negligable.


As for the Genesis bike you listed- yeah it looks nice. The site specifies the Volare frame's weight, but not Equilibrium, and given the tubing its fair to assume itll be heavier than the Volare, so probably about 2100g for the frame.


Neither of the bikes mentioned in this post are featherweight, but if the geometry works for you, they could be great. A set of quality wheels and supple tires plus light components is where a lot of weight is saved anyways.
The Genesis bike has a pretty neutral trail, and common numbers(bb drop, chainstay length, etc). Looks nice and the price is low.