I'd be very surprised if cams needed replacement :-/ Did your problems just appear during use or was the car laid up for a while? The 'tappets'/lifters can stick but don't usually require replacement, a few regular oil changes can make all the difference.
It happened whilst driving and the AA were called soon as the noise started. They advised probably cams issue, car was taken back to the house until the mechanic came round.
Unfortunately its a family members car and we would like to advice him on the best option for him before he puts any money into it. Now has a diesel and much more economy for work (travels a fair distance for work) but loves the car and will be hard not having the car. I wasnt there when the guy diagnosed the problem so missed out on all the information. But the head is still off the car now.
Thing is, the car is in really good condition. The alloys are great condition with really good tyres on them, car is washed, waxed etc VERY frequently, interior has been taken car off and first bit of rust that appeared was dealt with. Such a shame that this has happened which is an awful lot of money to put right.
If as you say, it may not be the problem, we will still struggle now to get another opinion on it.