Hi Paul, I have just be informed that I am at an award presentation for my son this coming Wednesday and will not be able to get up to the observatory. You will made welcome by the group if you still wish to go there. They are a friendly down to earth gang and will be able to answer all your questions about life, the universe and everything.

With regards to your telescope, there is a review on page 75 in the June issue of Astronomy Now (available at all good news shops) which gives it a good report. The price, >£I000, I believe, is with a mount (stand). The eyepiece that you mentioned is priced in the region of £50.
These prices are for brand new and in perfect condition.
See
http://www.greenwich-observatory.co.uk/acatalog/2__Eyepieces.htmlfor an example.