Right then (I remember why I hated Access and databases so much)...
Added an input mask to all my fields so that the data is automatically put into uppercase. However, in the form the text box puts the address on multiple lines, unless you have a space and more data after what entered. So for example:
will change when 'road' is added:
I've tried changing the width of the box and also the text size, in case space was a problem.. But to no avail, it seems the only way to get round this is to remove the input mask (something which in this place would be a bad idea).