From what I have seen, this is one of the major problems that the GOV.UK / GDS service model has thus far failed to address.
The advice is "keep the team around for each service indefinitely". Unfortunately this doesn't mesh well with either government technology funding models or the demand for increasing numbers of services.
The advice is "keep the team around for each service indefinitely". Unfortunately this doesn't mesh well with either government technology funding models or the demand for increasing numbers of services.