So do you get a lot of sales?
Your Flickr site is much better than your www.liverpoolpictorial.co.uk site in my opinion but I do understand that you have quite extensive coverage of the city and obviously that will attract some interest, it's like you are your own stock library.
Personally I would drop the HDR stuff I don't think it improves the shots and a lot of the Liverpool shots have very limited dynamic range to start with, there are a lot of good ones but some very average ones too.
Your Flickr site on the other hand has some truly superb images!