Glasgow's annual book festival programme is proving one of its most popular yet, with ticket sales ahead of this time last year.

Aye Write! has sold out a series of events already, including its opening night, and has added two new talks to the programme.

Tickets have gone on sale for two new sessions at the festival next month, which is based at the city's Mitchell Library.

One features a panel discussion of the newly released Cambridge Companion to Scottish Literature, and the other is an appearance by the author of the definitive story of the Clyde steamers.

Professor Gerard Carruthers, the author of the Cambridge Companion to Scottish Literature will be part of the panel discussing Scotland's masterpieces on the final day of the festival on April 20.

Andrew Clark will be appearing on April 14 to talk about Pleasures of the Firth, Two Hundred Years of the Clyde Steamers.

Clare Grogan will also be appearing with Ken McCluskey at the Celebrating Harry Papadopolous event which recalls performers in Glasgow in the 1980s.

Organisers of the annual literary festival, for which The Herald is media partner, have also reported that tickets for another half dozen events at the festival, which opens on April 12, are selling "like hotcakes".

These popular events include those featuring Jon Ronson, Jeremy Vine, the popular novelist Maggie O'Farrell, Ian Bell, Alex Gray, JG Moffat, the popular contemporary artist David Shrigley and broadcaster Gavin Esler.

Debates on Scottish independence and the future of newspapers will also be taking place.

Full events information and tickets are available at www.ayewrite.com.