These sites are helpful:
http://www.bada-uk.org
http://www.lymediseaseaction.org.uk/about-ticks/
http://www.hpa.org.uk/Topics/Infectious ... ndRemoval/
Although, unfortunately, the bada charity is now defunct the web site will be available until 2015
Another point to remember is that there isn't always the expanding red ring on the affected body part and a negative test does not mean you are clear of infection.
There is also an info sheet on the HSE web site that you can carry and show your disbeleiving doctor if you show symptoms