GWPF has published some interesting exchanges of letters. There's Turnbull and Whitehouse versus Rapley on the subject of sea level rise and Peiser versus Weintrobe too.
I was amused by Weintrobe's accusation about GWPF's nefarious intent...
GWPF’s aim is primarily to sew doubt on the findings of mainstream climate science.
...which conjures up lovely illusions of Lawson and Peiser stitching away furiously with blankets over their knees and cups of tea by their sides. It's not exactly how I imagined the great oil-funded conspiracy though.