It only has an Alexa Ranking of 132,821, though this is slowly increasing.
15,100 sites in Google with the term "business-directories-uk.co.uk/" but most seem to be worthless search results.
Is there any other way of determining traffic or whether its worth paying to be listed?
there are a few ways you can determine whether a directory listing will be beneficial.
if they don't provide any sort of traffic stats, then you may try asking them what sort of traffic you can expect, a serious directory will at least answer you.
the first thing i check is whether the link is a REAL link or is going through some sort of redirect, to check this look at the code of the page where you would be listed and check that the existing links to other sites are direct, ie htt*://www.yoursite.com, not something like htt*://www.theirsite.com/cgi-bin/redirectscript.cgi
also check the PageRank of the page with the google toolbar
with the toolbar you can also determine how many inbound and internal links they have going to that page.
hope this helps
dazz
<edited for typos and clarity :) >
Yeh, I did email them asking detailed questions about their traffic and marketing strategy, but no response so far.
Thing is that despite the CRM rhetoric, most online companies in my experience don't bother responding; the biggest businesses make it nigh impossible to contact them. Therefore whether a company responds or not to emails is not sufficient basis to determine whether they are worth paying to submit. Yet, I suppose smaller directories should make a special effort, otherwise how do we know what the worth is of paying to submit to them?