I WOULD like to say thank you to all those who have been involved in Tavistock's Christmas lighting.   The town is transformed every evening by the most beautiful lighting I have seen for many years.   I am sure many people, businesses and organisations big and small have been involved and I would like them to know that their investment whether in time or money or both is very much appreciated by all  those whose home is in this lovely town. Maureen Bridge Tavistock I VISITED The Wharf last night and as a consequence had to drive through Tavistock.   I just wanted to say well done to whoever organised this year's Christmas lights. We drove up West Street, down Russell Street and towards the police station and Guildhall. This is lit to resemble a castle and was really lovely, the lights in West Street and the decorated shops all added to the overall effect. Well done and a very happy Christmas. Angela Hulley Glendower Road Plymouth I WOULD like to say through your letters page what a fantastic job the council has done with the new Christmas lights this year. Absolutely stunning, especially on the way up to town from Plymouth Road — wow! Lilian Dyer Tavistock