Hi Squeezyjohn I had the same problem this evening, my plastic bottle cloches were way too hot for the plants at 7pm but I didn't want to risk just leaving them off suddenly at night....sigh. So we are now getting hot weather in Kent but the hotttest part of the day is the evening from about 5pm, super crazy weather so far this year.
Thanks Tee Gee I will try to make some larger cloches from plastic stapled together, I had never thought about doing it this way.
Thanks Galina for the tip there are loads of coffee shops in our town centre so I am sure at least one of them will oblige, never crossed my mind to ask them.