Its just for the little brass jobbie inside (although its now aluminium/brass). If you sign up to the MIG welding forum and PM a guy called weldequip. He'll be able to sort you out. He's a clarke supplier and a really nice guy (called Steve), really seems to know his stuff.
I ordered £80.04 worth of bits, new swan neck, regulator, tips, shrouds and wire at 3pm on tues last week, and i received it next day via parcelforce. He even knocked the postage price off for me when i ask for student/armed forces discount
He's highly recommended on the MIG welding forum.