I just went on Zooplus and had a look at mouse cages (not for me! :P ) and, although they're normally very good at offering suitable cages, they've now got the Savic Spelos. I know it's allowed under some crappy guidelines or other, but to me that cage is too small for a permanent home. Worth writing in and complaining?
Total size with pipes: approx. 42.5 x 38 x 24 cm (L x W x H)
Total size without pipes: approx. 42.5 x 29.5 x 24 cm (L x W x H)