To think this is really cheeky

Are YOU responsible if their children are injured on your allotted plot??? This goes past being nice or not, if legal ramifications are possibly incurred. Tell them you can

@Lovelycupofcoffee This is a few weeks old, but I hope you told them no. You would be responsible if anyone got hurt, and I don't think feeling sorry for a few kids is worth getting sued for an injury.

First it will be the trampoline. Then it will be a couple of chairs. Maybe a bike or two, and so on, until your space is just as cluttered and messy as your neighbors. Just say no.

Definitely no. You will never get that bit of garden back.

If they don’t look after their own garden, they’re hardly likely to look after the bit of yours you allow them to use.

A big, fat NO!

Absolutely not. They have their own garden and they trashed it. Do you want them to trash yours as well? I can’t believe you’d even consider it!

100% Hard No

I'd just say to them you got legal advice through your home insurance who advised you not to do this. Leave it at that or suggest they ask the neighbours if they can have what they were given back.

Say OK for half term only, but it will have to be gone after Sunday and you won't be able to host it at any other time.

Why would you even consider this?! They need to sort their own shit out and then they’d have room for a trampoline!

What they need is a skip. To put their junk in...

I'd print out the details of a skip company and have it ready to helpfully hand it to them if they start protesting and can't take no for an answer.

You didn't pay for an extra strip of land for their benefit... you have every right to spend time deciding what to do with it.

I've PM ed you OP.
We had a very similar set up and my advice is to say absolutely no and mean it.

Your neighbours already have a garden full of junk which they should clear out to make space for their own trampoline... and if they treat their property like that.. they will soon come to see the trampoline area at the end of your garden as their space and treat it accordingly, it will become a mess. Will they maintain the trampoline? I'm thinking missing springs etc. (which we had to sort in the past)

I'm assuming that the land at the end of your garden has a nice view and is a nice place to sit and have drink with your friend in the summer.

How will you do that with someone else's giant trampoline in the way? Added to which it will become an ongoing thing of people invading your space, with their kids friends etc. And you could end up getting involved in kids quarrels or accidents etc. Or asking them to keep the noise down. Effectively supervising them. Say no. So what if they don't like it. They need to find another way. You bought that house so that you could enjoy the extra space, not pay for it and then surrender your use of it to the neighbours for nothing.

I speak from experience when I say that People who regularly use your space, come to see it as their right and it will be difficult to get them to stop and move the damn thing if they start abusing your kindness.

no because they'll get used to it, so when you do want it back, it won't be 'thanks for letting us use it for so long' it will be resentment that you want it back! So just don't go there in the first place! Say something vague like you've got plans for it.
Apart from anything else you don't want kids bouncing around staring at you whenever you're in your garden!

I'd feel bad (but still wouldn't say yes!) if they had a tiny garden and yours was bigger but sounds like their garden has plenty of room, they just need to tidy it!

Are you the next door neighbour that got the extra piece?

They were stupid to turn down more garden in the first place.

They will never make their garden any less awful for their kids if you just let them have yours instead.

This was my first thought too; a wee lad at my school is off with a broken leg at the moment after an accident on a trampoline. Far too rarely do adults supervise children using trampolines.

So now they want yours? Absolutely not, the CFs.

Their garden is awful? Surely that’s their fault! Why can’t they clear it up! Why is it your responsibility to provide the lazy parents somewhere for their children to play. They are the ones who should feel guilt about that, not you!

No way - they'll make it an extension of their own garden and it'll look awful.

Then they can ask next door for it back! Absolutely say no and why haven’t they tidied up their own back garden?

My answer would be no & would be thinking that if they are cheeky enough to ask to use this space, what next?.

Why can't they clear their own garden to make room for a trampoline?

It's a strange thing to have asked. I'd say no.

Why on earth would you even entertain the idea? If they want a trampoline, they can tidy up their own garden.

They should get their bit back or tidy their garden?