I think its Serif's Photoplus 10 which has been superceded by several updates so it wouldnt be worth £59.
Interestingly, I had a copy of Photoplus 11 with a magazine earlier this year, I installed and registered it then started receiving offers of Photoplus x3 for £9.99 while x4 was the current version, then when x5 was released recently, got the x4 on offer for £9.99 which I'm using at the moment.
Its quite a good editor, with hdr photomerge, layer masks etc. The raw editor is pretty basic but I tend to edit those in Canon's raw editor then transfer to Photoplus.