"Took ages to get back to me with results"

Had a suspicious mole removed by the plastics department at Lister. I was really happy with the whole procedure and the whole hospital in general. Apart from them leaving an internal stitch sticking out of my skin so I had to pull it out with tweezers. And the consultant making a personal comment about me to my GP, about me being a pleasing lady (tad inappropriate). However the main issue came after I had the minor operation - they told me it would be 4 to 6 weeks til I received the result of the mole biopsy. I was a bit worried during this time as the mole could be something more serious. Anyway about 9 weeks has passed! Haven't heard a peep. So I called today (Friday) to remind them and they booked me in straight away (for Monday) to get my results! This made me think - how long have they had my results lying around for? And if I hadn't called them, would they have ever told me? I shouldn't really have to prompt them, they should contact me as soon as they have the result. Also they mentioned something about being really busy...