Nearby, another one flutters from the back of his favourite Land Rover as he drives to work as the local cornershop postmaster.
In case it’s not immediately clear, the Sri Lankan-born father of two – who fulfilled a dream to come to this country 17 years ago and took citizenship to make his life here – is proud to be British.
So proud, in fact, that he’s insisting all his fellow immigrants embrace our culture with the same enthusiasm as he does. Yesterday Mr Kumarasiri, who taught his two daughters every word of the National Anthem, introduced a controversial regime at his post office counter.
If his customers can’t be bothered to learn English, he tells them, they must go away and learn it before he serves them.
His bold stand against nonintegration has sent a shudder of political correctness down whatever spine the post office has these days, and infuriated some local do-gooders who accused him of inciting division among the community.
But a few minutes spent with the 40-year-old Liberal Democrat councillor are about all it takes to establish his motives are pure – and that he’s driven only by a passion for the country he loves.
‘Nobody stands up for anything in Britain any more,’ he said.
‘It’s the best country in the world as far as I’m concerned, but the great country I once called Great Britain has changed a lot since I came here.
‘All I’m doing is telling people if they want to live in Britain, be British. Don’t boo our soldiers when they come home from Iraq. Don’t live your life without embracing our culture. Don’t stay here without making any effort to learn the language. And if you don’t want to be British, go home.’
Sri Lankan-born Deva Kumarasiri introduced the ban this week because he believes all immigrants in Britain should learn the language and take pride in the new homeland.
Mr Kumarasiri, who runs Sneinton Boulevard Post Office in inner-city Nottingham, moved here 18 years ago and says everyone should embrace British culture.
But the chairman of the local Mosque confirmed that a petition was circulating among Muslim residents calling for Mr Kumarasiri to go.
Aurangzeb Kahn said: 'There has been concern that people can be denied Post Office services because they can't speak English.
'There is a strong feeling among some local people that this is wrong.
'A single employee should not have the right to make that decision, especially if he is an employee of what is a public facility provided by the Government.'
Mr Kahn confirmed that local Muslims have started a petition calling for Mr Kumarasiri's dismissal but stressed the move had no connection with his Mosque,
He added that the Mosque wanted to investigate the issue moire fully before making any further comment.
The controversial ban was a major talking point among many Muslims attending prayers today in an area of Nottingham with a large Urdu-speaking Pakistani community.
One man, who refused to be named, said: 'There is a lot of anger about this.
'We understand his point but it can take years to learn English and there are some elderly people who are too old to learn.
'A lot of people think he is wrong and want him gone.'
Mr Kumarasiri, who was inundated with cards and messages of support from across the UK said: 'I don't expect everyone to agree with me.
'It was inevitable that those who don't want to be fully integrated into this country would do something like this.
'For me it proves that there are elements out there who have no intention of ever [becoming] integrated.
'But I've had dozens of letters, cards and phone calls all supporting my stand.
'I'm really pleased with some of the letters which are from immigrants who came here without a word of English but taught themselves the language because they are determined to be British.'
A steady stream of well-wishers have also travelled to the 40-year-old father-of-two's post office to voice their support.
Police have also been keeping a discreet eye on the premises to ensure he did not attract the wrong sort of attention from people who may resent his new found celebrity status.
Mr Kumarasiri added that he understood that his employers, Newrose Personnel Ltd, had discussed his ban but he had heard nothing from them about his future.
Yesterday a spokesman for the employment agency refused to comment and referred all calls to the Post Office.
A Royal Mail spokesman said: 'Post Office branches are a vital part of all communities and are open to all customers.
'We are taking steps to ensure that this happens at Sneinton Boulevard Post Office.'
Meanwhile the Liberal Democrats distanced the party from Mr Kumarasiri, who claims to be a Lib Dem member on his local Gedling Borough Council.
A spokesman for the party said: 'Mr Kumarasiri has not been a party member since October 2007 when his membership lapsed.'Just more proof that the moslems do not want to integrate but that can be expect from them, what is so fooking disturding here is the Liberal Democrats who just happen to be very anti BNP, are distancing themselves from Mr Kumarasiri, and taking sides with moslems, and looking for their vote.
Now this stinks, and more proof that the Lab/Lib/Con are just a bunch of fascist liars.
After a little googling we can find that our hero is still a councillor