Vision 4 Way Variable masthead Amp & PSU - DASTV.co.uk would be adequate for the four outlets required.
There are other makes that will do a similar job as well.
S/He'll also need a lot of WF100 cable, a box of cable clips and a bunch of screw on F-plugs, too.... A separate cable from the masthead amp to each room outlet will be needed. The amp needs mounting near the aerial (outside). IF the existing cable is good quality it may be re-used for the lounge feed - but it may be better to replace it.
The power supply connects to one of the downleads in one room and will need to be on permanently (they are designed to be run that way and only consume a few watts of electricity).