This was the case when I traveled. But, it was advisory only, not compulsory. In fact it was never even mentioned when we arrived.We are hanging on but the rumour is that France will reciprocate in the next few days and make Brits who travel over isolate for 14days in France.
if this turns out to happen then we will also have to cancel.
Im not saying it will be this again, its just worth checking what is actually required.