Content update to practices.json 
Content update to practices.json 

Change based on '2i' content review - updated phone number format for Wallington to match content style (020 8XXX XXXX not 0208 XXX XXXX).
nhsuk/register-with-a-gp-beta-web,nhsuk/register-with-a-gp-beta-web,nhsuk/register-with-a-gp-beta-web