I have also done a Whittam day at knockhill. Which I loved. As the lads are saying, you will get a lot more track time with Whittam, and meet some very well known racers. I was in the novice group, and had Whittham himself (think it was his first time back teaching after his cancer treatment) and Iddon as dedicated instructors for our group.
I'd never of had the confidence to take the BMW to knockhill, if I hadn't already done a couple of Haslam days. Although I have to admit, when I went and did the fire blade 1 to 1 with Haslam, I felt it lacked track time, and didn't gain a huge amount. The first couple of times I went on the 600s (second time was last minutes so couldn't get the blades) I felt I gained a lot.
It is convenient as well, as plenty flights from Scotland to East Midlands, and no hassle of taking helmet and leathers with you. Get it booked stu!
I'm hoping to get to another Whittham day this year, but don't know if I'll have the time.