The Intellectual Property Office, WIPO, ITMA and CIPA have issued warnings regarding unsolicited mail and “invoices”. For examples, please see:
http://www.ipo.gov.uk/warning.htm
http://www.wipo.int/pct/en/warning/pct_warning.html
http://www.itma.org.uk/faq/unsolicited-mail-or-invoices
http://www.cipa.org.uk/pages/IP-scams
If you have received an unsolicited IP-related letter please contact your Boult Wade Tennant attorney, who will be glad to review it with you and advise what action, if any, is appropriate.