I know someone who's all over that silver shit. There's some guy on youtube who's raving about silver this and silver that. But my opinion is anyone who advertises a money making scheme isn't using it make money themselves so it's likely bollocks.
Precious metals are one of the oldest stores of value known, hardly some internet pyramid scheme. Its a hedge well worth while if the impending Global financial doom which I'm expecting happens.
I'd stick £15K of that straight into Silver Britannias with the aim of selling them in about 7 years.