Spanish people usually shake hands between men, two cheek kisses between women, two cheek kisses between man and woman (except when you are at work, in this case both will try to keep the distance) and when you really know someone a hug is fine.
However in England is completely different people usually just say Hello, shake their hands each other, just one kiss and the variation of cheek kissing and then go in for the one arm hug or a two arm hug.
when you are a foreign in Spain the rules are easier but when you are the foreign in England you never know what to do, if you try to shake your hands and other person want to kiss you will seem rude, if you try to kiss someone may they think you are going too far and the last one, when someone knows you are foreign and they try to copy the way you are and you don't know how many kisses one or two.
Oh my god, even say hello can be extremely uncomfortable.