This one nearly slipped under the radar. I know that Lambeth Living aren't able to resolve your service charge queries, but it appears they're better with pets.
According to a Gumtree ad, Lambeth Living and RSPCA are offering a free microchipping event for dogs and cats at the North Lambeth Area Housing Office on Thursday 25th Feb (this week), from 16:00 - 18:00. No appointment is required.
North Lambeth Area Housing Office is at 91 Kennington Lane, SE11 4HR
The ad. doesn't say that you need to be living in Lambeth Living accommodation. It appears that anybody can bring their dogs / cats along.
Event is supported by Lambeth Council Environmental Services.