Thank you all for your replies! 

I accept that feedback is voluntary and I have to take on board that some do and some don't. 

And the comments about receiving feedback after the monthly reminder from ebay, have proved to be true as I have received feeback recently from a transaction that took place last month.  So thanks putney32 and kopenhagen5!

I like the suggestion made by aj and pj and yes so true about quoting AP delivery dates pj!

Thanks mccrea2007 for your advice, great idea about putting a short message about posting item and contact me if any problems.

Thanks again everyone for your comments.

Fiona