Below are links to useful resources.
Domain Recover : www.domainrecover.co.uk
Be the first in the queue to register deleted, suspended, detagged and expiring domain names by using highly developed domain recovery dropcatching technologies.
Domain Trace : www.domaintrace.com
Find out which domain names have been registered using your name and protect your brand or trademark.
Domain Hospital : www.domainhospital.com
UK based DNS tools.