They're the party to watch at the 2015 general election. Having won the European Parliament elections in 2014, and a by-election in Clacton-on-Sea to secure their first ever elected MP, Ukip is on a roll and looking into the future with eager anticipation.

It's extremely unlikely to happen in 2015 or even 2020, but there is a niggling possibility that one day the populist, traditionalist anti-EU party – if it doesn't implode from its many internal contradictions – could win a general election. However, with Labour and Conservatives both in crisis and looking incapable of gaining over 35% of the popular vote, Ukip as a coalition partner is becoming an increasingly realistic option. The government they would sit in would be the most right-wing in post war history – but would it spark an exodus from the UK?

Whenever there's the prospect of a sudden change to the UK's political landscape, there are threats to leave. In the 1960s, musicians like Mick Jagger and the Beatles scarpered from the country's enormous tax rates – which hit as high as 98% on unearned income.

The 1970s brain drain saw many Britons flee the industrial disputes, three-day week, blackouts, and high tax rates blighting the economy.

When the UK was looking at the prospect of a Labour government under Neil Kinnock to follow 13 years of Conservative rule by Margaret Thatcher then John Major, The Sun famously ran the front page asking "If Kinnock wins today will the last person to leave Britain please turn out the lights" amid concerns of a return to the economic paralysis of the 1970s.

Every time a new or increased tax on the wealthy or business is mooted, there are howls from the City that higher taxes will force people to take their money and leave the UK for somewhere else, like the Cayman Islands.

So who might leave under a Ukip government? Most businesses want to stay in the EU's single market, but Ukip wants to pull the UK out. Several big firms, such as Goldman Sachs and Ford, have warned they would rethink the scale of their UK operations if it withdrew from the EU.

And Ukip may frighten off many migrants in the UK with their hostile stance towards immigration. Moreoever, the metropolitan liberals in London might be tempted to hop on the Eurostar and swap Hampstead for Montmartre.

Would you stay or go if Ukip won a general election and put Nigel Farage in Number 10 Downing Street?

Tell us why you made your decision using the comments box below.