Mothers' Union has updated the advice to members based on ongoing government advice. To summarise, even outside, we should only meet up in groups of up to six when the people are from different households.
Please see the webpage for more details.
For most branches this will mean that an outside meeting is still not feasible, but you could consider having several smaller get togethers, six at a time. Zoom is also a great way to meet up virtually for those who have internet access.