Yes but GB is still broke post WWII and has both GB and some German tooling in this TL...
Yes but despite being broke they did develope the Enfield .280 British!
It existed and until Churchill became Prime Minister again the UK had fully intended to rearm with one of several firearms designed around it and the Enfield No9 rifle or EM-2 and the Taden (effectively a Belt fed Bren gun) was briefly officially adopted in 1951
Also in the offing was the 'Original' FN FAL designed around the .280 British (later modified to 7.62x51 NATO)
and the FN FAL Bullpup (My favorite) - which despite being the 'short model' had a longer barrel than the 'long model'
Not to mention the Taden (if it looks like a Belt fed Bren gun...well that's because its a belt fed Bren gun)
The decision to go 7.62x51 NATO was political not financial as they had to retool for the US 'Lite' round as well!