Consumer units or fuse boxes as they are sometimes known as, have come along way in rece years. There is more emphasis on safety with RCD's becoming common practise ,giving you the peace of mind you need in your home. Older wiring will not always work with new consumer units, so its always best to get an EICR(Electrical Installation Condition Report) done on your property first and get an accurate quote for a board change, along with any other repairs that may arise from the inspection.