"Is this individual likely to be deployed ?" a very good chance dependant on trade.
"If so how long is a deployment likely to be for ?" most call ups are done under sect 56 of the reserves forces act 2000 witch is 1 yr in 3.But you will find that he or she will be mobilised for 6 months.
"As an employer am I obliged to give time off for training and deployment ?"
Not for training but if he/she gets mobilised then they must be released. Although you can appeal against the call up so if that person is say involved in a large project and it would be detrimental to leave at that time they will defer the call up.
"Am I obliged to pay this individual whilst on training/deployment ?"
No Some support in different ways some may give 2 extra weeks paid or give two extra weeks unpaid others basically say they must take time of their annual leave its down to you. If that person is called up then you can claim to have their post filled
His commitment is 1 weekend a month and 2 wks continual a yr.
I done 10 yrs in the reserves and can say it was hard without my employers support but was always great full for it and found it worked two ways.
you will find the answers on sabre web site