That's going to be very difficult since there a so few dialup users left in the country now; I am assuming you want an 'unmetered' service and not a 'local call rate' one?
As I type this we are going through our entire ISP List database in preparation to launch the new listing system and I can tell you that a lot of unmetered dialup services seem to have vanished.
The review system has some reviews but they are mostly a few years old because obviously that section has not been active for a long time, due to the dominance of broadband. That and we launched the new review system when broadband was the main service.
http://www.ispreview.co.uk/review/categories/2.html
The only ISP of any note that really still pushes dialup is Vispa, though Fast4 - despite a bad reputation for broadband - also has an unmetered dialup service still going. I think Vispa is the best bet but we cannot speak to the quality of these services anymore.
Mark 'Winter' Jackson
Editor-in-Chief - ISPreview.co.uk
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