Feedback is really helpful, so anyone reading this blog who has any helpful suggestions or insights please do not hesitate to email me or post a comment.  A colleague who recently looked at my blog has come up with a brilliant suggestion regarding the contacting of respondents.  He said:

"If you have not found a solution to your phone problem I strongly suggest what we did.  Although we already established a dedicated BT phone line for the research it is no longer terribly useful.  Use some of the Health Foundation money to buy a dedicated mobile. Then wherever you are and whatever you are doing it controls the access that your clients/participants have.  If they need to cancel the appointment with you - they can with no hassle of GP receptionists.  1471 does not matter. All the related expenses are easily tracked. etc etc".

What a simple suggestion, excellent!  Thanks.