The Royal Mint will do you bars from 1g upwards (about £70).
Hatton Garden Metals lists smaller ones, but they're out of stock.
Every day's a school day. ETA - Akshully, I dunno why I am so surprised by this. I used to buy silver all the time from the dealers in Hatton Garden when I was dabbling in silversmithing.
@jsabine started
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The Royal Mint will do you bars from 1g upwards (about £70).
Hatton Garden Metals lists smaller ones, but they're out of stock.