Lawns in the UK will always recover. Don't water 'em and rejoice in the fact that grass-cutting is minimised in dry spells. Our last hosepipe ban in Cornwall was in 1995. We were still permitted to fill water butts with the hosepipe and then fill cans from the butts. You may find you're allowed to do this. Nosey neighbours might still think you're in breach if they see you doing this, of course. So erect a 30-foot fence between you and them first.