Not really race fit any more, but still happily hanging with the A group when I was last riding the road bike much – though I was properly race fit when I got the 50-34, and it would have worked fine in races I did (though I was running 53-39 when I last raced). It works fine for fast road riding.
You don’t need it, not with an 11 sprocket – not really even with a 12 sprocket. I’m also in the Malverns area and still using an 11-23 with my 34-50 (not trying to willy wave, just make a point) – I don’t feel any need for a bigger top gear, and I do like to pedal the downhills. Either learn to spin a bit more or just tuck and coast – I’m certainly faster coasting before I spin out 50-11. 110rpm is almost 40mph, and you’d have to put out a lot of power at that speed to get any advantage over tucking in.