Jackie Leven, Cabaret Voltaire ****

Something seems to have shifted in Jackie Leven’s life. About six stone, to be precise. At the Edge Festival show the Fife-born folk-blues-soul troubadour was, almost literally, half the man he used to be: the rotund, Rabelaisian figure of old was dramatically slimmed down and sipped water rather than, as at a recent Edinburgh gig, glugged from a bottle of white wine. Perhaps it’s the side effect of a bladder infection he told us (a little too much) about, and which necessitated a “comfort break” halfway through. Or perhaps, at 61, this notoriously hard-living man is finally looking after himself.

Something seems to have shifted in Jackie Leven’s life. About six stone, to be precise. At the Edge Festival show the Fife-born folk-blues-soul troubadour was, almost literally, half the man he used to be: the rotund, Rabelaisian figure of old was dramatically slimmed down and sipped water rather than, as at a recent Edinburgh gig, glugged from a bottle of white wine. Perhaps it’s the side effect of a bladder infection he told us (a little too much) about, and which necessitated a “comfort break” halfway through. Or perhaps, at 61, this notoriously hard-living man is finally looking after himself.

Dana Alexander, Underbelly ****

After 12 years in the business, Dana Alexander, an ebullient and instantly likeable presence on stage, is still the only black woman on the Canadian comedy circuit. Not that her ethnicity is Alexander's pre-occupation – it most definitely isn't – but it does play a part in her act.

Lounge Room Confabulators ****

Imagine that Tim Burton, or some other great modern-day storyteller of your choice, knocks at your door and asks if he can come into your living room for an hour to tell some fantastical stories. You would get some beers in and friends around pronto, right? Well, the Lounge Room Confabulators, a duo from Australia who tell stories in the Burton style of weird and dark, do just that – turn up on your doorstep and then perform in your front room, your garden or your office, wherever you have space for 10 or more people.

Margaret Cho, Assembly ****

Margaret Cho is back, and how. Ten years away from the Fringe, the American-Korean bisexual - “I'm just greedy, I guess” - is a little softer around the edges maybe, but still as funny. With her lefty humour, punctuated by lots of adult content, she is waspish, but definitely not Waspish.

The Monster in the Hall, Traverse ****

David Greig's indie comedy musical, first performed at Glasgow's Citizens Theatre at the end of last year, is a bright and inventive four-hander about a 16-year-old girl struggling to keep everything together. Duck Macatarsney (Gemma McElhinny), who writes escapist stories in her room, cares for her biker dad, known as Duke, who suffers from multiple sclerosis. At the beginning of the play Duke (Keith Macpherson) is struck blind.

The award-winning Australian comedian Sam Simmons is shuffling around in a pair of bread loaves. He's wearing them like slippers and trying to take bites out of them at the same time. Indeed, his tremendously silly show, Fail, is essentially a shambles. This is the overarching joke: it's his absurd non-sequiturs and his tongue-in-cheek, shamateur performance style that reduce his audience to spasms of laughter.

It must be the beautiful British weather that has attracted a bunch of American comics to UK shores recently. Just before Las Vegas legend Rita Rudner starts a short season at the Leicester Square Theatre in London and hot on the heels of his Curb Your Enthusiasm sometime colleague Jerry Seinfeld (who recently did one night at the O2 in Greenwich and of whom more later) comes Jeff Garlin. He plays “fat fuck” Jeff, Larry David’s agent in the HBO sitcom, which, I’m delighted to report, returns in a new season on the BBC later this summer.

Jerry Seinfeld, acclaimed New York stand-up and star of the eponymous American sitcom co-created with Larry David, last performed in the UK 13 years ago. He’s currently doing a brief European tour and, while keen fans were quick to snap up tickets at the O2 in London, there were noticeably bare areas in the vast arena last night. Lots of British comics have managed to sell out the O2 (some repeatedly), but those unsold seats should come as no surprise; ticket prices started at £75 and went up to an astronomical £300, so the burning question must be - was he worth it?

It’s been more than two and a half years since the third series of Jack Dee’s comedy about a comedian. Everyone in Rick Spleen's world looks a little bit older, a mite more pinched and drawn, as if proximity to the man about the house is draining the blood out of its occupants. Time has not at all been kind to Rick himself (but then, when was it ever?). His temples are awash with grey, his skin is sallow with failure, and his self-important delusions seem ever more steeped in bitterness and malignity. I for one have missed him dreadfully.

Even if you are not of an age to have watched Monty Python’s Flying Circus or Fawlty Towers when they were first broadcast by the BBC, you will have heard of John Cleese. And if you are remotely a fan of comedy, you will hold Cleese in high regard as he is a writer, performer and actor of great talent, and this show, an overview of his life and career, proves it beyond argument.