Copywriting for an existing website which is being redesigned

Num. of words: Please see below
Industry: Business
Information for the business: We are a member organisation for commercial mediators
Topic: Rewriting the copy on our website, http://www.businessmediators.org.uk
Tone: Other
Outline & Structure: We don't have the skills or experience to be able to complete this section properly, but are happy to reply to messages and then get on a call if we are to proceed together.

Our website is dreadful and we are having it redesigned. The copy is also dreadful, potentially worse than the website in fact. We would like to convey our offering, events, purpose etc in language which is simple, elegant and engaging.

We will take the existing text and turn it into something which is slightly better than the original, some of which is plain wrong or confusing. We will then turn it over to you to work your magic.

We like to work collaboratively.

If you want to propose an alternative approach, please do so.
Extensive research needed: no
Extra notes: None for the moment