The Eurozone accounts for 43% of Britain's exports equating to just 27% of GDP. A collapse in the Euro may result in a recession and a drop of 5-10% in GDP.
However most of Britain's exports are resistant to recession - pharmaceuticals, oil and petroleum products and weapons.
We also export business and legal services, financial services, design, media and consultancy.
London is Europe's major financial centre. The Eurozone countries will need people to re establish their national currencies and they will need people to trade them against the dollar.
Legal services will be awash with work redrafting contracts and unravelling the ensuing legal mess.
Consultants will be in demand by the big firms due to the chaos.
As people seek safe havens rather than keeping their money in Euros, the London property market will see a boost that could spread across the country.
Any revival of the housing market would be a boost to the economy. Countries would invest in Britain relocating here to escape the unstable Eurozone.
There may even be an opportunity for British companies to grab assets across Europe at knockdown prices as the Euro collapses in value.
