I live in Newcastle Upon Tyne!
So not near you, sorry!!
You can buy the sing and sign DVD from the website, amazon, mothercare...and I believe there is a copy of the video on ebay atm.
You could also consider joining the website at some point in the future (would wait and see how you feel after using the dvd) as there is a vidoe dictionary of about 100 signs on there.
You could also buy the cd as there are songs on it that are not on the dvd.
By the time your lo knows the dvd backwards the new one will be out as Sasha Felix is currently producing a new DVD!!
Other than that...get your family on side, partner etc and be consistent! start with a few functional signs (eat, drink, more, all gone) and then watch what your lo is interested in and use signs for those things (with my son it was ducks!).
Communicating with your child is amazing and there is nothing better than knowing that they understand you and even better- the grin you get when they know you have understood them properly!!
good luck