Yes! There is a UK wide closed Facebook group for ‘MVP’ (England) and ‘MSLC’ (rest of the UK) chairs and service users here https://www.facebook.com/groups/MaternityServiceUserReps/ offering vital peer support.
There is also a multidisciplinary Facebook group for anyone interested in or involved with MVPs here www.facebook.com/groups/NationalMaternityVoices
Regions may also have their own networks e.g. London MVP network, West Midlands Maternity Service User Reps, Maternity Voices Greater Manchester and Eastern Cheshire network. with others emerging constantly.