Annoyed at myself. Managed to buy a project box that is too small for the arduino to fit inside!! I bought one that had a slide off cover as part of the main cover so that the 9v battery can be removed but forgot to take into account the position of the screw posts that hold the lid on and it clashes with the arduino. Back to the drawing board and looks like I'll have to get a box and a separate battery box so going to have a few unneeded parts sitting at the end