Richard, the drawings and articles for the Vega Twin are in the following Model Engineer.
Part 1, 3 Jan. 1986, Vol 156, No 3768.
Part 2, 7 Feb. 1986 Vol 156 No 3770.
Part 3. 7 March. 1986 Vol 156 No 3772.
Part 4. 4 April. 1986 Vol 156 No 3774.
Part 5. 2 May. 1986 Vol 156 No 3776.
Part 6. 6 June. 1086 Vol 156 No 3778.
I have copies of these articles in JPEG form, plus line drawings of the plans in Adobe format.
There is a problem, I dont know how I can attach these in replies to postings, because if it was me, I would do it. But, does it infringe copywrite and will it annoy some readers or protocol.
The solution to the above problem could be solved if Dave Clark included these articles in the Model Making section, or some friends or other forum members over there in England may have the relevant issues in their library. As a last resort I could email or surface mail them to you, But again, putting your private details on a web site is generaly frowned upon so I leave it you to decide.
Some of the photos of the finished Vega look fantastic. GO FOR IT.