Thanks for the reply hawk.

I've been looking at magnetic double glazing, which I think uses acrylic sheeting.  I don't want to block out anymore light than I already have (got heavy light blocking drapes).  Although roller shutters might be the cheapest option.

All this because a neighbour decides that playing loud doof doof music anywhere between 7am to 8.30am every weekday is ok.  And no I can't approach them directly, they are liable to tell me to get stoofed and then cause trouble