I have gallons of the stuff! Excellent but it's machine use only.
For silver I would reccomend
Budget kit: AG SRP, FK1000P. (that's usually sufficent imho) (~£30)
Intermediate kit: any AIO hand polish, a glaze (poorboys white diamond?) and FK1000P (~£40-45)
Relatively Expensive: Da polisher, Megs 83, Menzerna PO85RD, Werkstatt kit. (~£170)
Expensive: Rotary polisher (can be dangerous if you are unsure of the history of your bodywork), ptg, M105, M205, Werkstatt kit. (~£310)
Alternatively, get a detailer to sort it out for you and use the Werkstatt kit as a LSP and top it up yourself. This may work out cheaper that buying the rotray kit and PTG. Allow £37 per hour or so, in total expect about £300 for their work(but this can vary from just over £100 for a relative newbie to nearly £1k for a pro).
All prices are roughestimates from the top of my noggin so they may be a wee tad out but it will give you an idea. I would also like to suggest you get a clay bar and use the two bucket methond and a wash mitt too.