How far are you from Manchester?
A good 150 miles, but there's a train I can take direct from London to Manchester which only takes about 2 1/2 hours. As the St Mirren game is an evening kick-off I'll have to find a hotel overnight (I actually just booked one) but for the Brondby game I will be able to go up and come back all in one day - I've done it plenty of times before for football matches.
I actually have a number of family members who live around Manchester, and I know a friend who is studying at the University there. I probably could've crashed with any of them, but the hotel was the easier option.