Being on social media is invaluable. Set up a Facebook group and a Twitter page and have a generic email address (e.g. email@example.com) so that addresses can stay the same if a chair moves on. Best practice is to have two admins on any social media account.
Once you have social media accounts and an email address, get your MVP on National Maternity Voices map http://nationalmaternityvoices.org.uk/toolkit-for-mvps/find-an-mvp/ so that HCPs and women can find you.
Introduce yourself to the Communication managers in local Trusts and CCG and seek their assistance in raising profile of the local MVP.