I will be travelling around Europe (Portugal, Spain, France, Belgium, Netherlands, UK and Ireland) in July. Of all the countries that we are visiting, the UK is the only one not to use the euro currency. I will be changing USD to EUR and would like to avoid changing too much money into GBP that I won't use afterwards. So basically my question is if I can use Euros in shops, hotels, taxis, restaurants etc. and leave the rest of the sterling cash for small payments.