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Duelist

I'm not too sure of your terminology, but I presume you mean a "soap bowl with soap". If that is what you mean, there are a number of places in the UK. The best bet would be to Google...

It would depend on how often you shaved, how many passes.

There's too many factors to take into consideration, to be exact.

I use a 65g tub of Edwin Jagger soap, and shave about every two...