The Incredible String Band's Mike Heron is marking his 70th birthday by setting out on tour with long-term collaborators Glasgow four-piece Trembling Bells.

The Circle Is Unbroken tour also celebrates the release of ISB's Live At Fillmore East, 1968 through Hux Records earlier this year, and will take in both well-known and rare material from the band's catalogue.

The dates follow a series of previous collaborations between the two, beginning with the ISB night A Very Cellular Song at the Barbican in 2010 and running through further shows and a 7" of Heron's 'Feast Of Stephen' (listen at the foot of the piece).

Tomorrow, after appearances on Mark Radcliffe's Radio 2 Folk Show and Marc Riley's 6 Music show last week and this (listen to the Riley session here), the tour starts - have a look at the dates below:

JULY
Sat 13 - Brewery Arts Centre (Malt Room), Kendal
Sun 14 - The Greystones, Sheffield
Mon 15 - Sage Hall 2, Gateshead
Tue 16 - Hare & Hounds, Birmingham
Wed 17 - The Stables, Milton Keynes
Thu 18 - Bush Hall, London w/ Shelagh McDonald
Fri 19 - The Globe, Hay On Wye
Sat 20 - Exeter Phoenix, Exeter
Mon 22 - The Globe, Cardiff
Tue 23 - The Junction 2, Cambridge
Wed 24 - South Street Arts Centre, Reading
Fri 26 - The Acorn, Penzance
Sat 27 - Barrel House Ballroom, Totnes
Sun 28 - The Blind Tiger, Brighton
Mon 29 - Chapel Arts, Bath
Tue 30 - St. John the Evangelist, Oxford
Wed 31 - Academy 3, Manchester

AUGUST
Fri 2 - Òran Mór, Glasgow w/ Shelagh McDonald
Sat 31 - End Of The Road Festival, Larmer Tree Gardens, Dorset

OCTOBER
Thu 31 - Eastern Promise Festival @ Platform, Glasgow