I've had a nagging sense of guilt for the last few weeks... with all the attention we've lavished on Edinburgh's winter festivals, we've left our London-based readers in the Christmas cold.  But never fear: the link between our two capitals is stronger than ever this month, as three undoubted hits from last year's Edinburgh Fringe open for runs in London.

First up comes Barbershopera 2 (left), transferring to the Trafalgar Studios after a much-feted second year in Edinburgh.  Last August, FringeGuru's Lee Zhao celebrated celebrated the quartet's musical talent, highlighting their striking achievement of a through-sung show without accompaniment or electronic support.  As the quirky name suggests, all that skill's put to good use delivering close-harmony comedy; and while I admired the singing too, I have to admit it's the offbeat humour which made the show for me.  Like Lee, though, I wasn't sure about the ending - I'll be interested to hear whether they've kept it intact for London.

A few steps further into Theatreland, the Tristan Bates Theatre has just begun hosting a three-week run of Play On Words.  I reviewed this one in Edinburgh myself, and I cannot tell a lie; I was fairly lukewarm at the time.  But Three's Company (right) have been in touch with me, explaining that they've completely re-staged the play and addressed the points I raised.  I'm an admirer of these guys' past work, so I'm hopeful their new production will do full justice to their darkly clever script; weather permitting, you might spot me in the audience for this one on Saturday.

A week from now at the BAC - and later in the month at the Barbican - you can catch Nic Green's Trilogy.  Regularly cited as one of the most influential pieces of 2009, Green's three-hour three-parter attracted as much attention for its joyful nakedness as for its skilfully-executed dance theatre   Not everyone liked it, of course, and for a controversial view on its Edinburgh run look no further than our own Susannah Radford.  It's only fair to admit, though, that ours was the minority view, and to prove it here's a link to one of theatre's rarer sights: a five-star write-up from Lyn Gardner.

The weather outside is frightful - so wherever you are and whatever you're doing this January, I hope you'll enjoy some quality time in the theatre.  Perhaps I'll see you there!

Barbershopera 2: Trafalgar Studios, until 6 Feb, daily except Sunday, times vary.  Ticketing website.
Play On Words: Tristan Bates Theatre, until 23 Jan, daily except Sunday, 7:30pm.  Theatre website.
Trilogy: Battersea Arts Centre, 12-16 Jan, daily, 7pm.  Theatre website.
Trilogy: Barbican Theatre, 22-23 Jan, daily, 7:15pm.  Theatre website.