35 halogen downlights (OX2 Abbey Rd)

Replaced all of our downlights recently; I have 35 fittings with transformers, chocolate block connectors and choc boxes. The fittings go into a 70mm diameter hole in the ceiling. 2 or 3 of the bulbs have been replaced by GU10 LED bulbs, and 2 or 3 of the bulbs are non-existent. But apart from that they work fine. However, you should fit intumescent fire hoods over the top of each of them inside the ceiling if you are going to use them.