DISABLE / DROP INDEX causing deadlock
Problem solved

Very hacky but got the system back

Set the deadlock priority to high to stop it being auto killed

there are a lot of external apps that access the DB which ended up blocking the drop index (information from the master..sysprocesses table) (but not reporting as blocking through all the checks we have), so I just killed until there was nothing more in its way, dropped straight away

cheers for the quick eyes over