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Thanks Marg0, I will take my letter in and send emails as well.
I don't think they'll kick me out as I'm not going anywhere that I'll be in competition with them; I'm just moving house to another part of the country; therefore I wouldn't be able to get into the office to do their work.
I know what you mean about that though: when I was young, one of the sales reps where I worked handed his notice in and they made him work the entire month's notice in the board room with no access to telephones, etc. This was obvioulsy a lot of years ago, before mobiles and stuff, but it must have been horrible for him, poor guy.