Marine Super Store in Port Solent do them for £149.95.
https://www.marine-super-store.com. I don't think the NE one is listed on the website but they do sell it so you could order over the phone.
You could also give Pumpkin Marine Supplies a call - 023 92468794.
It might be worth waiting a few weeks as Garmin are about to release version 7. They are already taking orders for the update CDs so it can't be long now.
