English Lops are quite big, this one looks like a Dwarf Lop but he is still young. What is the Lionhead's temperament like? They are usually quite sweet. The runs should be ok as you also let them out to have a run round the garden. Have you had a look on the Rabbit Welfare Association's website? It's full of excellent advice regarding diet, housing, bonding etc. Also, if you join, you receive a lovely Magazine every month with very educational articles in it and beautiful photos! Did your rabbits get the triple vaccine? Not all Vets have got it in yet.