With the advent of the digital switchover I need to provide a digital signal to 4 TVs. The TV in the lounge has socket from an aerial in the loft. Is there any (simple) way of splitting the signal from the loft aerial and getting it to the 3 other TVs?
Assuming you are asking about digital terrestrial signals, these can be distributed using a normal UHF distribution amplifier in the loft. See here for an example Google "maplin.co.uk/module.aspx?moduleno=29413" this also assumes each tv has a digital tuner inside or a separate set top box.