leads are always dangerous and are only a very temporary fix. U can buy sockets that can be wired to a single outlet but have more than 2 outlets, up to 6 I think, could be more. the idea is you take off the single socket and replace it with a multiple socket. Do this and you'll be surprised how few leads you will need. Go to an electrical store and ask about the multiple sockets.
Use of an adapter is safer than leads.
Best of all call in an electricain, ask his advice, get a new consumer unit fitted as well if it is needed. Not as dear as you think. Look at it this way, cost 800 euros but you live 20 more years, cheap at the price.
Electricty kills.
noah