I'd imagine exactly the same as the situation for last weekend with the Athletic grounds being within the restricted area and sports specifically mentioned as not affected. As they have said, there won't be a complete lockdown unless there's a severe emergency. Worst case it'll go behind closed doors, but personally I don't see that happening just yet. Economics just don't stack up right now. They may say public health comes first and it does, just first behind everything else!
By the way, the wording is "allowed to meet outdoors in a private garden......" and not just "outdoors" which is obviously a clever play on words.