This will open a can of unnecessary worms.
My tip go to a free public display and buy them all a burger or two.
1 save yourself a whole wad of cash, given fireworks are now mentally expensive for what they are - a couple of seconds of flash/bang/sparkle. Long gone are the days of a box of Standard fireworks in the back garden.
2 a load of H&S measures for 5-10 minutes, when you can let someone else go through all the agg.
Eight/nine years ago a church near to us which had been doing a firework display as a fund-raiser for as long as anyone could remember, got a call from the council saying they had to do this and this and this and have insurance. They contacted their insurers and it became financially unviable, unless they started charging a set fee rather than a donation. They’ve not done one since.
We have two free displays in our area and that’s where we took our kids and had an hour or so out. There is one display near to us where they charge £8/person, but you can see it for nothing for miles around.