They started using a two-metre distance from Monday 23rd, just before lockdown started.
Yes, just watched a few clips on YouTube to try and figure out the date.
I wonder if they will drop the 2 meter rule between presenters when (or indeed, if) restrictions end on the 21st June?
My guess is that if the government remove a requirement for social distancing entirely - then TV shows will return to pre-Covid staging.
If the government continue to request social distancing - many TV shows will continue with it - at the distance required. (Given that the 2m rule has been with us pretty much since the start of the government pandemic recommendations, and not been relaxed without mitigations being in place (and even then only if absolutely necessary), I suspect it'll be 2m or nothing)