Help me transform my backyard (cheaply). Pics.

[moonmaker]

An a complete novice so bear with me
Moved into a rented property. My landlord has refused to do anything about the backyard but it's in a state . As the pic shows , weeds , moss everywhere , dirty flagging, badly weathered walls etc. Now I don't have a huge amount of money to transform it but really want to make it as nice and as child friendly as possible . I have a budget of around £400 but can stretch to £500 at a push ( I know that isn't much !).
I have 3 dc- 12,11 and 2. The older 2 might want somewhere to sit outside when it's warm and the little one would probably love an outdoor toy or two like maybe a mud kitchen and a slide or a water table .
Where do I start ? I really want to make it clean, attractive and homely .
All suggestions appreciated .
Thanks .

And this

Place marking for ideas!

@eloisesparkle it's facing west
Thanks everyone for the responses haven't gone through everything as just got back from a long day at work but will do as soon as I get the time. Someone's coming to help me paint the walls on the weekend and I have a jetwasher coming in next week

Clean slabs will make an absolutely amazing difference.

I would suggest jet washing before painting as all the dirt from slabs will spray all up the nice freshly painted walls.

I agree get the walls and floor jets washed first, and go from their.

If you do get a sandpit I try and get on with a lid so the local cats can't use it. Some thing like this.

I would some outdoor fairy lights to string across to add atmosphere at. What about some colourful outdoor beanbags or floor cushions to add colour.

Sorry there not their.

Oh OP - west facing, how lovely.
So lots of lovely barbeques on summer evenings.

Whitecovers that's indeed lovely and really inspiring - I love the chairs . Tea thanks for sharing - it's amazing what you can do on a budget !
Have arranged for the jetwashing to take place on the Saturday and will do the painting after- phew

I think the chairs are from Homebase - about £30. Keep us updated!

@IlikemyTeahot haven't been home during daylight these past few days but will get one for you that's really kind of you !

Lovely ! I think it is a great space. If you buy planters you can spray them with an outdoor friendly paint. I picked up a lovely Jack and Jill chair and painted it last year. Was a bargain. Will post a photo

OP you need to jet wash first. No point painting the walls first - jet wash is a messy job and the spray goes everywhere! All the muck from the flags will end up on your newly painted wall.

Also I would jet spray the walls too. The power should remove the flakey paint without you having to sand it off.

Definitely jetwashing first and have registered the tip about the stabilising solution . Am
So excited !

Watching with interest! Have a similar set up to the side of our house.

Your picture reminded me of this pic I'd saved on pinterest awhile ago. Weed killer and a good scrub down would be a great start.

A better picture

So the guy does by the jetwashing never turned up and had me waiting in all day

You should just buy one. It's quite satisfying to do.

That's so annoying !

Oh that's terrible - whereabouts are you? Perhaps someone on here can recommend someone reliable or lend you a pressure washer.

I've got someone else booked in for tomorrow. Hopefully they will turn up. Would consider buying one although I'd have nowhere to store it !

He's here . Could almost do a little dance .