Yes i did manage to remove the rim and glass.
I had to lay the speedo face down on an old rag and then bend the rim away from the clock with an screw driver.
You must bend the rim in very small amounts at a time and work 3 1/4 of the way round so you can just see the edge of the clock, it should now come apart.
This is not a simple job as you do not want to mark the front or side of the rim.
I have still to get new glass to finish the job, when i do i will let you know how i get on.
NICK