Most Multi-Standard radios allow you to pick the country you are in from a list - UK for example, and when selected will give you access to that countries full CB Radio allocation.
Once you've made your selection the radio will always turn on with that preset still, so you don't need to set it up every time you switch on.
The legal CB system in the UK is on FM mode, many European countries have AM allocations too, so using a Multi-Standard radio on AM in the UK is illegal, even though it only requires a couple of button pushes to put it onto AM - unless you're going abroad - keep it on the UK setting, which gives you the 80 channels (UK and EU bands - 40 channels on each - go Here for more info about the two bands).