UK 5.0Ghz Channels Missing

Userlevel 2
Hello, We've setup channel bonding on our 5.0Ghz channels and selected a custom channel plan to take advantage of the higher power channels. We've noticed 116-128 are not available. We believe they should be? We have a small deployment of Aruba APs that we are going to replace with the Extreme which use those channels fine. We're using AP3825i APs, set to UK location. Are we missing something?