A huge flag won't fit in many places. Barnsley have a huge stand behind the goal so it'd definitely fit over seats there.. Can't think of anywhere else really.
I have used/spoken to Barmy flags a fair bit. On their website, the biggest size appears to be 25ft X 12.5ft. Although I'm sure they can/would make bigger if asked.
Just arriving home myself. Absolutely dire 1st half performance and better in the second. Deserved all we got though. Our support was woeful tonight. Travel all that way, yet the majority just sit there.
We booked Manchester Travelodge weeks back when it was 30 quid for a 3 bed room. Now the price is well above 120 for the 3 bed room because it's United Chelsea in the 2nd leg.