ASmith1946 wrote:
>
> >
> >They still are available in the UK. I've bought bottled versions of all
> >three and cooked with them. Many people still make them at home too.
> >
>
> Arri:
>
> Where do you buy them? I was able to get the until a few years ago, then they
> disappeared.
>
> Andy Smith

Usually they are in larger (and maybe posh) supermarkets or specialty
shops in the UK. The walnut ketchup/catsup was harder to get and seemed
to appear around Christmas mostly, along with the pickled walnuts. Never
tried to buy it in the US and haven't tried to buy any in the UK within
the past 5 years.

Let's see what's online:

mushroom ketchup
http://www.ketchupworld.com/geowatmusket.html

anchovy ketchup/essence
http://www.britishgoods.com/Sauces.htm
(although anchovy paste works perfectly well in most recipes calling for
the essence)

Didn't find an online source of walnut ketchup/catsup. You might ask on
uk.food+drink.misc if someone can get you a bottle (if it's still made)
and send it along.
Otherwise Mrs Beeton has a recipe for it.