I've started to come across prices on foreign websites in euros, and I've no idea how much one is worth. It was all much simpler when I could divide the cost of a prix fixe by 10.

A number of eurozone countries are starting to quote the price in euros next to their own currency - Amazon in France has a special offer just now where delivery costs "1 euro seulement". And after January 1, euros will appear in larger type on supermarket prices.

So how do I know how much it's worth?

The key thing to remember is that while the value of the euro will fluctuate against the pound -and will continue to do so - the other currencies will be locked into a static exchange rate. A euro will be worth around 6.5 French francs, 166 pesetas, 1,936 lira and so on. Travelex's guide details the implications for British travellers.

And what do they advise?

Check when the country you're travelling to is finally phasing out old coins and banknotes. This varies quite a lot, although you can still exchange them at banks. They also advise you to insist on change in euros, and to bear in mind that Scandinavian countries and Switzerland haven't joined.

You still haven't explained how much a euro is worth...

As of Monday, nearly 62p. The best currency converter I can recommend is xe.com/ucc.