You seem to be missing quite a lot. You might try National Geographic's distributors. (Trend's UK) http://www.trendsuk.co.uk/
They might be able to supply spare parts.
Failing that, your telescope uses the 0.965 inch type eyepieces which aren't particularly easy to find, although they don't usually cost very much if you do. If you type in '0.965 eyepiece' into eBay or any other web site that sell that sort of thing you will find what you need. The quality of those eyepieces will probably match the quality of the telescope you have. I noticed there was a '0.965 kit' for £21.