The head of the British police contingent at Euro 2012 has praised the behaviour of England fans.
Around 5,000 supporters attended each of the opening four matches in Ukraine, with a similar number expected in Kiev for the quarter-final against Italy.
The atmosphere inside the Kiev fan zone before England played Sweden was occasionally tense, as a number of Three Lions supporters squared up to some of those from Scandinavia. The situation did not escalate beyond pushing and shoving, and not a single England fan has been arrested for disorder during the tournament.
Assistant Chief Constable Andy Holt, who is leading the British police in Ukraine for the Association of Chief Police Officers, said: "We've been very pleased with the way they've behaved and the response that we've had when we've spoken to fans. If you'd offered me this at the start of the tournament I would have taken it.
"There have been no arrests. There have been occasions when it's got quite lively but we've managed, with our Ukrainian colleagues, to intervene and prevent it escalating."
Troublemakers previously issued with football banning orders were required to hand over their passports before the competition began.
Mr Holt's message to any of those who have kept their passport and were considering coming out to watch England was: "Don't even try it."
Police were already seeking to arrest those who broke the terms of the banning order. Even if they evade the checks at UK, Polish and Ukrainian borders, the final layer of defence is the British officers at Euro 2012 who are on the look-out for fans with banning orders.
If England progress to a semi-final against Germany in Warsaw, the number of British police at the match will increase. There are 18 officers in Ukraine and six in Poland but they would combine in the face of huge numbers of England fans who would travel for that match. Work is already under way in Warsaw to prepare for an invasion of Three Lions supporters.
Mr Holt said: "There would be a significant increase in the number of fans travelling and I think there's every likelihood that fans without tickets would travel just to be in the fan zone and be part of the atmosphere in the city, so we'd have our work cut out."