A little known fact. If you have a deferred FS pension, (seems you have), it will sit on the company's books as a bad thing. A future liability. At some point, they may look to get rid, and make it worth your while. And if interest start to dive, that liability becomes bigger and bigger.
I wont reveal the real figures, but similar happened to me. The transfer value to get rid rose 6 fold in 24 months to make the decision a pretty easy one to make. See the post about Nikkis pension I got. It is all about asset matching and liability management.