We stumbled across Field Skills on a Guardian feature about their work in the Lake District and discovered they put on activities in Borneo where we were due to visit!
We promptly booked a Scuba taster day and outdoor rock climbing and enquired about a Mt Kinabalu climb. Christine was extremely helpful in organising the first two, and gave us advice on how to organise the climb (even though they would not be able to sort it for us and would therefore receive no money!).
The activities were great, very well organised from start to finish - the rock climbing was a particular highlight - we were driven out to the jungle with some local instructors who helped us up the rock. Everyone was very friendly, helpful and welcoming and I'd definitely book with them again.