Many men find acupuncture works well to significantly reduce hot flushes.
Some hospital Macmillan cancer centres will offer this, and in some places you can get up to 4 sessions on the NHS.
There are drugs to reduce the effect too such as medroxyprogesterone (better known as one type of The Pill), but these all have side effects too, and you should probably only go this route if the hot flushes are a significant problem, and you've tried all the other workarounds first. Also, medroxyprogesterone is currently in very short supply, and you'd be lucky to find any, but there are a couple of second line drugs too.