RTW elastic sided slip-ons, where to buy?

Hi,
I am currently in the market for plain, black elastic sided slip-ons, formal shoes to wear with a suit. Most of the obvious shoemakers/ brands, e.g. Lobb (Paris), EG, C&G, New & Lingwood, Eduard Meier etc. do not have what I am actually looking for. I know this is a typical English style and very difficult to buy anywhere outside of London.
As I do not live in London and won't have the possibility to be there in the next few months, I am looking for source somewhere in Germany's, Switzerland's or Austria's major cities, or alternatively an online source.
To give you an idea of what I am looking for, an example taken from Lobb St. James website:

An alternative could be something like this, from Cleverly's RTW range:

But for the Cleverly's I would also need a source, as I do not know their lasts and would therefore not order them without trying them on.

Any tips where I can find such shoes?

Thank you very much for you help!
noface

Cleverley's website mentions a stockist in Hamburg, if that's helpful.

Also, don't the models Chelsea and Byron by Gaziano and Girling meet your description?

Thanks, Henkie. Yes, I called the store in Hamburg, they don't carry the entire range, but it would be an option to try on a shoe from the same last and then order it. The other thing ist, that I wont be in Hamburg in the next six weeks...
Regarding Gaziano & Girling: I actually had a look at their shoes a few days ago but they don't really have what I am looking for. I do not really like the Byron -last (and the suede part of the shoe) and the Chelsea is not plain...same thing with the Chaster...

BTW: is it possible for you to see my sample pics? I somehow can't see them, when I open the thread - only when I try to edit my posting...