Glastonbury 2015 secret sets: Who will be making surprise appearances at the festival?

Bastille are almost dead certs to appear while Blur are also strongly rumoured

Dan Smith of British band Bastille, who are hotly rumoured for an unscheduled performance at Glastonbury (Getty Images)

Every year at Glastonbury, the rumour mill goes crazy with reports of 'secret sets' by unscheduled acts.

Someone hears something from someone who 'knows' and hundreds of people turn up at a tent or stage in the woods either to find nothing there or a bitter disappointment (think Kaiser Chiefs on The Other Stage last year).

Yes Thom Yorke and Jonny Greenwood from a certain massive festival band called Radiohead did surprise everyone on the Park Stage five years ago but whether an event of that calibre will happen this time around remains to be seen.

Metronomy performed a warm-up gig last summer and 2013 headliners Mumford & Sons rocked up in the Avalon Field for a more low-key appearance, so anything is possible.

Here's who we reckon may be packing their wellies:

Bastille

Bookmakers William Hill are so convinced the pop-rock quartet will be popping up as a Worthy Farm surprise that betting has been suspended. Odds were slashed from 7/1 to 1/2 in just 90 minutes on Tuesday so perhaps someone out there knows something we all don't...like maybe they'll be on before Florence + The Machine in the four hour Pyramid Stage gap?

(Rex)

Blur

They said they would have been keen to step in for the Foos had Emily Eavis given them a call before asking Florence but would they ever support her? Probably not, but a low-key set at one of the smaller stages could well be on the cards.

(Sara Lincoln Photography)

Foo Fighters

Dave Grohl's dream of headlining Glastonbury was just about to come true when he went and broke his leg falling off stage in Sweden. Fairly obviously jumping around the Pyramid isn't going to happen anymore but we reckon there's a solid chance (10/1 at the bookies) that the rockers will perform an acoustic set somewhere instead, albeit with their frontman confined to a chair.

The Charlatans

Tim Burgess could not have been less subtle about this one - he went and tweeted a picture of a pair of wellies and asked his followers if they had 'guessed yet'.

Fleetwood Mac

Yes it's unlikely that this massive band would arrive unannounced at Glastonbury. Any unscheduled appearance would spark a mass detour to wherever Stevie Nicks and co were playing but with only Sunday free in their calendar, they'd have to really want to do it.

(PA (PA)

Other outside chances include Taylor Swift who is in the UK for British Summer Time Hyde Park and Prince, following his string of hugely popular London gigs earlier this year.

Noel Gallagher's High Flying Birds are available if called and some punters even reckon the One Direction lads will bring their global hits to Somerset.

Here's who is definitely playing: