The email from Web-Police-Warning.com reads as follows:

Hi there,

I write to you in the hope that you are the proud owner of http://www.duffieldderbyshire.co.uk and responsible for updating the http://www.duffieldderbyshire.co.uk/scams.htm page.

I notice on the page that you quote the International Web Police/ InterGOV International. I'm not sure if you are aware or not but this organisation is run by an individual and is not officially recognized by any official agency that can be traced.
A letter to the NHTCU National High-Tech Crime Unit (Andy Letherby) www.nhtcu.org in the UK might clear upo any illusions you may of had of the International Web Police's supposed official capacity.
The Web Police site makes many claims of official recognition and endorsement by official agencies.
We have written to many of them and have yet to find one that recognises any of their outlandish claims.
These pseudo official agencies have been seriously misleading the public for many years and do not have any Police powers, are mainly staffed by children, incompetents and even convicted criminals as background checks are never performed.
There are no genuine Police Officers in their organisations as claimed and the individual Bill Howes from Canada is their chief investigator.
He has had no training and from seeing his investigation work also has very little clue what he is doing. You can find out many facts about these agencies at http://consumer.net/intergovfaq.asp and by visiting http://www.web-police-warning.com, a site dedicated to exposing their antics.
The State of Florida sent them a letter recently detailing impersonation of Police Officers, displaying Police Badges, misleading the public and not carrying a disclaimer.
You will find scans of the letter on the http://www.web-police-warning.com site.
Two of their ex sponsors are also considering legal action against them because the Web Police refuse to remove links to them listing them as sponsors. These sponsors do not wish their corporate images to be tainted by the activities of the Web Police.

We ask that you kindly read the above material, consider removing your link to these agencies and not mislead the public into thinking that they are able to help them. We also ask that you might consider instead warning them about the Web Police instead.
The NHTCU already does this by referring people who ask about the Web Police to the above resource in an attempt to educate them on the dangers of giving out personal details to people like the Web Police.
If you read the articles about criminal records of staff members and the sorry state of affairs in their organization you may share the same concerns that they are in fact a danger to the public and should not be further promoted or encouraged to mislead people.
Some checking with large Police departments might also help clarify that nobody recognizes them and that their credibility and reputation is very poor to say the least.

Best Wishes
Webmaster
http://www.web-police-warning.com