Hi Keith,
Thank you for taking the time out to reply to my post, I have tried to take a picture of the mark on the base but it seems almost impossible, I have taken pictures of a similar acid etched mark on the base of a Webb vase I once had, and I was able to get a close up image with the same camera, though the mark on this vase is more faint. I have looked at a website called stylendesign in there glass marks section and it looks the same as the Early Stuart mark late 1920's onward image on the website. The mark changed in the 1950s so that still only allows me to be able to narrow the date down to between a 25 - 30 year gap hope to be able to norrow it down to an actual time of manufacturer and designer if you can help I would really appreciate it.
Many thanks again
Fisher