A few places you can list on David:
http://www.hotfroguk.co.uk/ (Highly recommend!!)
Make use of the fact that you can add as many keywords for your business on Hot Frog as you can, as this will give you a link for each word or phrase.
http://www.freeindex.co.uk/East_Anglia/Hertfordshire/ http://www.hertfordshirelocal.co.uk/ http://www.thebestof.co.uk/hertford http://www.ukvillages.co.uk/village/...-Hertfordshire
There's loads more...