Andy
No need to worry OC PSF (he'll only go and ask the chf clk anyway)! Your local (Sqn/Eng Wg or whatever your wg is called forward/depth/base sp ...) Clerk should be able to tell you. If you have access to the Intranet,you should be able to find for yourself in AP3392 Vol 2. If I get chance when I get in tomorrow, I'll look it up and give you the reference (sad I may be, but not that sad to know each AP3392 reference).