Reminds me of 35 other threads where people think the pandemic is broken into teams. Like this is some really bad sequel to Twilight.
Odds of me completing my trip in early June to Germany, Spain, and the UK? 0%
Why? I cancelled it because I don't think it will be a good idea. I am on 'Team: Common Sense'
Odds of me getting all my money refunded? 45%
My situation is different from yours. If you think the risk is negligible, then I suppose your only question is whether you would be able to legally enter borders.
Odds of being able to go to the UK without a mandatory 14 day quarantine in August? I would guess over 50%
Odds of anything being remotely normal or open in Europe in early June? My opinion: slim.
Should you go? Can you catch a virus you don't think is bad? Who knows?
Your August trip will be August in Europe, which is definitely going to be a different August in Europe this year. A lot more Europeans staying closer to home.