Why is your user name Guns related and your sig block Sigs and Tankies, if you're asking about the Sappers?
To serve alongside Royal are you considering 29 and 148 Bty?
I could tell you loads about 59 (as was), I did 11 years with them all together, and I did 22 years as a Sapper, but I think you're being a bit less than clear.
Good luck with the Tankies and Sigs, although if you go Sigs there's always a chance of a draft with HQ and Sigs Sqn.
(Oh yes. Forgot to add..........flicker,...WAAAAAAAAAAAAAAAH)