UK folks I’m here to help, growing up poor in the American south has left me with a specific set of skills and knowledge.
I know a bunch of yalls houses if not most of em don’t have central A/C if even a window unit. I’ve been to your country in the summer and know it’s humid as hell. You’re gonna need a box fan, some ice, a bucket, and a drill with a hole boring drill bit. Bore four holes in the sides of the bucket, dump in the ice and then secure the box fan to the top, we always used duct tape. That’ll cool shit off pretty well until the ice melts at least for the room you’re currently in. Filling up any sinks with ice can help too if there’s no airflow to the bathroom.
It ain’t perfect but it’s better than nothing. Just a tip from your friendly neighborhood hillbilly!