Half price Synoptic Problem

I am happy to find a copy of my book The Synoptic Problem: A Way Through the Maze half price -- at the SPCK Online Bookshop, £7.50. I thought it a bit overpriced at £14.99 when it first came out, so it's good to see it's now available a bit cheaper. So if you haven't got your copy yet, here's your chance! Apologies for the self-promotion, but if I can't peddle my own wares, who can?