Welcome to the UK Hart Dyke web site.
There isn't much here, but you might find more Hart Dykes at www.hartdyke.com. Maybe I'll even get round to updating that site from the sorry shambles it is currently.
Are you a Hart Dyke? Do you want an email address @hartdyke.co.uk or @hartdyke.com (or both)? Then drop me an email and I'll sort you out. All you need is an existing email account to which your mail will be forwarded.