Here is one that does all ages, the downside being that there would need to be all 4 of you and it is also in Scotland.
http://www.outdoor-extreme.co.uk/family_advent ure_course.html
Centerparcs do a 2 hour survival course for that age.
My husband took they boys away last summer (1 at a time) and did some wild camping and they really enjoyed it. The summer before, he just went to a campsite and I think they still got a lot out of that as they got to cook their own dinner and breakfast on the camp stove.
Hope you find what you are looking for - you will find at that age, they are easy pleased and just the chance to sleep in the tent and cook beans and toast and hot chocolate on the stove is a thrill!