No UuA; see this thread:
Upgrading a BA flight on EI ticket
Airport upgrades (AUP) can only be done on the day of travel at the airport. As it a BA operated flight you would ask at the BA desk or lounge if there are upgrades available and the price. EI would have no involvement. See this thread:
https://www.flyertalk.com/forum/brit...thread-34.html