Dogs Trust currently provides a free microchipping service at our Rehoming Centres; please contact a centre directly to book a mutually convenient time.
http://www.dogstrust.org.uk/az/m/microchipping/default.aspx#.T5f2-C8jJnN
http://www.dogstrust.org.uk/az/m/microchipping/default.aspx#.T5f2-C8jJnN