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@Adam_T
I was riding 50/34 this summer but found I never used the 34, have now swapped to 52/36 which seems more useful, I would make sure you have a 11t at the back though.
I use a 48 on my hack bike as there's never time to get up to any speed between lights in London but I wouldn't recommend it for open roads, IMO.
As for aftermarket chainrings I always use TA and recommend them.