I get Hamburg (a) Keegan and Anderlecht (a) 1977 mixed up a little but
Anderlechct for me was 48 hours on a coach, the beer in Brussells, the Saints fans singing "Chanson D'Amour" to the bemused Belgian cops and Channon having a good goal ruled out for offside. (Years later there were allegations made that were never refuted that the ref took a bribe).
The coach left at midnight from West End, Southampton - you can imagine what sort of state everyone was in.