www.crossroads.org.uk is the website in question. They are also featured on the parkinsons.org.uk website - some of their branches work closely with Crossroads.
Will your Mum go to the support group or ask for help from such people?.
As for Social Services I would actually speak with Crossroads first off before having any involvement with them as they (Crossroads) will actually have more experience. Also many SS depts are overstretched and underfunded, any help will be a long time coming if its actually suitable that is.