I did it a few years back. https://www.comedy.co.uk/forums/thread/29570/
For me, I got the actors on board first -- because they were in a (relatively) well-known film, that gave me a bit of a legup when I contacted a local producer that I found on a website. It was UKScreen or Mandy or one of those, I can't remember now, but there are a few sites to look at. That guy's team/friends became the crew on the short, and had their own equipment.
That film cost me about £800 altogether. The actors were paid, and everyone else had their travel covered. And the bus in the film cost about £350 to rent for a couple of days. Location-wise, it was just a couple of emails and calls between myself and the guy that was in charge of that kind of thing for the local council. Some councils will charge, though.
There were lots of things that I and others did wrong on the film, and it's always a tough experience. But rewarding, too.
Everything depends on the kind of film you're making: If it's something that you can make low-key and just want to put on YouTube, you don't need to worry about big equipment, local council permission and licensing music. But you can get a crew and equipment for free/expenses/very little if it's only a couple of days. There are lots of people at or just out of university that want experience making films.
Licensed music would be the biggest unavoidable cost if you really wanted your film to be completely cleared and there was a song you absolutely had to have.
Good luck with it.