SB34 - if the tests are like my experience, they will be a) a mammogram (not painful but weird, having your boob squashed between 2 x-ray sheets!) followed by a consultation with the consultant. If he can see or feel the lump he may ask for an untrasound, usually done there and then. They scan the lump, just like having a baby scan. When I had my u/s, the radiographer said that they could immediately see a 'hot spot' in anything of concern. If, after that they are worried, you might be referred for a needle biopsy of the lump, or as I was, for immediate excision of the lump, followed by a biopsy of it.
More to the point, there are now minimum standards in all areas for referral to a breast clinic. You are entitled to ask your surgery what they are in your area, and also entitled to ask them to fax the referral through. Chase it, you are entitled to the minimum period of stress and worry possible. good luck!