See all those lean and fit people out and about on the British High St? Nah, I can't see them either. Obviously 42% of people in the UK are not USING a bike with any regularity - you just need to leave your house and walk down the road to grasp that, no analytical data required [if you are interested in the data, it's more like 10% of people ride once a week or more].
Clearly ownership and usage are not the same thing, but cycling miles are up 23% from traffic counting stats in the last ten years. 3.5 billion miles in 2016 [down from a whopping 14.7 billion miles (!) in 1949], but a small but steady increase in recent times.
I would guess that participation in more competitive cycling is very significantly up on that just on the basis of the boom in amateur sportive events - there's one every week nowadays catering for all levels whereas it used to be just rock-hard audaxes that 10 people would enter.
https://www.cyclinguk.org/resources/cycling-uk-cycling-statistics