Neil Fergusson is expecting 150,000 - 200,000 cases a day peak in the UK, but reasonably optimistic it won't strain the healthcare system. That seems rather... high. I doubt there would even be enough people taking tests even if it gets to these numbers TBH.
On the other hand, there have been huge RSV outbreaks in the US, Australia, NZ, etc. suggesting there's some truth to the "immunity debt" theory. Apparently, there could be more children hospitalized with RSV in New Zealand than people hospitalized with Covid-19 in Scotland right now (extrapolating data from Wellington, based on a recent Guardian article). So I'd expect hospital wings to see a lot of children with RSV, perhaps even more than people with Covid-19, in the upcoming months in Europe.
