Quidco are giving members £60 off the normal price of £135 if you buy a bottle of their Blue Label. They also do engraving for free as a Fathers Day promotion. Plus free delivery EDIT: Sorry, its free insurance, not free delivery.
I haven't been fortunate enough to try Blue Label, but I hear it's quite excellent.
Even if you don't have Quidco, I still think it's worth it as membership is only £5 a year.
Quidco link: http://www.quidco.com/johnnie-walker-blue-label/