Only just seen this Sophie.
I would suggest squashing moths if you find them in or near hives.
You really dont want them laying within. Its not a pretty sight and the comb would have to be destroyed. They love old comb and/or weak colonies, (strong colonies seem to manage the problem).
It helps to replace comb on a regular basis and store drawn comb carefully. One common mistake is to store comb without treating (to kill waxmoth larvae and eggs). Acetic acid or freezing.
I freeze mine . That kills all stages.
Hope that helps.
Tim