Piccolo Pan, 1973. Mass market paperback.
ISBN: 0330236148 (but this also seems to be a non-film version..)
No illustrations, but there are colour photos from the Fox-Rank film starring Fiona Fullerton as Alice, Peter Sellers as the March Hare, Dudley Moore as the Dormouse, Robert Helpmann as the Mad Hatter, Ralph Richardson as the Caterpillar, and with Michael Hordern, Spike Milligan, Dennis Price and Flora Robson.
The pencil mark inside tells me it was bought for 25p (which is also the original price on the back cover!), but goodness knows where from. Possibly the second hand bookshop in Southwold at a guess.