Well, Rhododendron ponticum isn't an Azalea and what's more you can't but it anywhere - in fact it's illegal to sell it since it's classed as a dangerously invasive weed.

I would guess that you're looking for Rhododendron luteum (with fragrant, sulphur-yellow tubular flowers) which used to be known as Azalea pontica? You can get a moderate selection of Azaleas, including this very widely grown species at most decent garden centres, and a much better selection at many specialist nurseries.

Alternatively check out the RHS Plantfinder online to find a supplier near you:

http://apps.rhs.org.uk/rhsplantfinder/pfregions.asp?ID=15369

azalea's you can buy at most garden centres

Maybe look at this website :
www.forestry.gov.uk/.../196010F167115B7180256ED9004A090C
for info on the rhododendruon ponticum.

Grandmage, I found that the page you give the link for can't be found. I tried the forestry commission website & found this general article -
http://www.forestry.gov.uk/fr/INFD-63JJVS

Ok thanks ,sorry Beattie, about that I just copied it !!