I second Ian, keep a number of a good lawyer on you. Ask around for a good one, never rely on a duty solicitor they are so hit and miss and you do not want to gamble with your liberty. You can phone and ask them if they provide 24hr representation at police stations.
If you should get arrested do not speak to the police without your solicitor there. Even if you have done nothing wrong always think of yourself as being guilty. This is the advice I received from a current serving policeman (a friend). He told me to never ever try to help the police without the advice of a solicitor. The default setting for policemen/women is if you volunteer information to help them you are only doing so to hide other stuff from them and they will see it as a sign of you being involved.
They will always try to get you to talk to them without legal representation by telling you all sorts of stuff, like it's better for you, you look less guilty etc. Do not listen to anything they say and stick to your guns about not talking to them until your legal representation gets there.
Trust me when I say don't say anything to the police without good represention. If you do talk the chances of your case being dragged out is very, very high, even if you have done nothing wrong and they don't have a shred of evidence against you.