I've just released the 2015 edition of Paul Hardy's Session Tunebook. See http://www.pghardy.n...tina/tunebooks/. Now 518 tunes, and over past two years has had a fair amount of remedial work on existing tunes from previous editions (particularly the chords), so if you have an earlier version than 2014 (or are using a downloaded version, e.g. on a tablet) it's not a bad idea to update.
It's free for download as PDF for printing off, or increasingly for people to use in tablets like iPads. You can also download for free the ABC file and use a program to play along with - I have a page on Playing ABC.
Alternatively, you can order a printed and nicely bound (can fold right back) copy from Lulu.com for £7.50+pp.
If you bought a copy of the printed 2014 edition, there is available for download a 2014 Annex to update it to include the extra tunes of the 2015 edition.