Channel 4 like their men and want one for everything. They've had The Restoration Man for a while, now they're introducing The Landscape Man. And . . . well, I think that's all, to be honest – but if there was one more, I'd be on to something. Kevin McCloud is obviously The Architecture Man, they just forgot to call him that. There'll be others soon, I'm sure: handsome men who know something about something, The DIY Man perhaps, or The Lover Man. They should just get one, who knows how to do it all, The Perfect Man. I'm available, if they're reading.

So who is The Landscape Man then? He's Matthew Wilson, a gardener who likes to do it on a grand scale. And he helps out other people with their haughty horticultural projects. Like Keith in Devon, who isn't content with a lawn and borders, and maybe an apple tree and a few herbs for a bit of The Good Life. No, Keith's constructing a system of canyons in his garden, to be filled with wild flowers. He's digging a series of ponds that flow into each other. He's creating a Mexican desert, adobe walls, a giant pergola. Keith isn't a man who does things by halves. It's making me tired just watching.

The Landscape Man explains that it's not just about the garden. Keith recently lost his job at a public garden, after a disagreement with the new management. This is about re-establishing himself, putting pain and anguish behind him. Trouble is he has taken a lot on, and it's putting a certain amount of pain and anguish ahead of him too.

The Landscape Man doesn't get involved, get soil under his fingernails; he stands around shaking his head, playing the realist to Keith's dreamer. To be fair, he comes up with the idea of Keith's missus having an exhibition of her paintings to raise some cash, and he does donate some pond-liner, but he's not having much creative input.

It's Keith who's the inspiration in this show, and I'm now looking at my own tiny patch of north-west London in a whole new way. I could put my own pain and anguish behind me, dig a canyon here, a little Greek temple there, or create the Hanging Gardens of Dollis Hill. It might amuse the neighbours. And The Landscape Man could come along and shake his head and say "I told you so" when I run out of money and energy and everything else.

The Autistic Me was an excellent BBC3 documentary last year about three young men with autism spectrum disorders. It worked because it was serious without being worthy. It was relaxed, warm, sometimes funny, but at the same time it gave a real insight into how Oli, Tom and Alex saw the world. And how the world saw Oli, Tom and Alex.

Here, in The Autistic Me: One Year On (BBC3), we're going back to see how they're getting on in their lives and their attempts to become a little more independent. There's good news and bad. Oli's frustrations have worsened; he still doesn't have a job, even though he can name the kings and queens of England, and their dates, from the year dot. Asda have said they'll employ him as a shelf-stacker, but haven't yet. Come on Asda, every little helps. That's not your slogan? Well, no one knows what is. There's no place like Asda? There's no place at Asda, more like, if you're Oli.

Tom, who was the most troubled of the three last time, is doing better. He's in a band, and even has friends. Yay. Now all he needs is for his family to stop treating him like a five-year-old.

And Alex is still charming. Plus it's all still on with Kirsty – well, as on as it can be when you live 100 miles apart and can't afford the train fare. But it's Kirsty's birthday – her 18th, or possibly her 20th, he's not sure – so he saves up and gets over there. With his mum, because, as we learned last time, she goes along on his dates with him. I wouldn't like my mum on my dates, but Alex is pretty cool about it.

They go bowling, and then for a meal at a pizza place, where mum waits outside and pretends not to watch through the window. "Thank you for being my girlfriend," says Alex. "You're welcome," says Kirsty.

Just like their last date, it's painfully awkward, squirmingly excruciating to watch. But also lovely. And so is the film.