Leeder Marketing and freeseo.co.uk - anyone use them?

[Gerry]

I've been contacted by these companies, both apparently out of the UK, indicating that they have advertisers interested in posting links on some of my sites. Long term contracts paying 50-100GBP per month, per link.

I have not entered into any agreement and have requested more information.

Has anyone used them or worked with them on projects?

Thanks in advance.