Yes, I always service annually regardless of mileage. It's not a big cost in the grand scheme of things.
Glad your van is being reliable Mike!
I have cash in pocket to buy an L4 now too, so if you see anything around, let me know. Up to around 6.5k.
(I'm already on Ebay/Autotrader/Gumtree, but it's still easy to miss things).