Header for web-site

I’ve added a banner to the web-site.  It’s like the main picture on your Facebook page and provides a common header to all pages.  I used the picture we took for the service at St Dunstan-in-the-West, but I would like a better one.

As with Facebook, the banner is a cropped version of a full-size picture.  Any suggestions ? Please send a regular picture and I will crop it to size. If there are lots of pictures, I will implement a ‘banner of the month’ scheme !