Thank you very much Brian, for the advice. As you suggested in your book, trying to Squint and line up the sights against the target must be skill you have to master.
I will definitely try the Tape idea over the left lens to see if this improves things regarding concentrating on the sight picture, if not then more practice looks the way to go.
Your book is a no nonsense approach to being able to improve a person's shooting skills, well worth the time taken to read it thoroughly.
Thank you for your reply.
Regards.