Yes we’ve had an ongoing issue with our website showing a 502 bad gateway error over the past week for small amount of users. We are of course taking action to try to diagnose and solve the issue. Unfortunately it’s not a simple one.
Meantime you can resolve the problem in your browser by deleting the specific cookie for allen-heath.com and clearing your cache.
I am on a Mac with Safari and I too have been getting the 502 bad gateway blah blah blah notice. I use Firefox and have no problem getting to the A&H website.