A. No. Sweep Safe Certified chimney sweeps cannot undertake any gas work (unless they are also independently qualified as a gas installer). All gas work must be undertaken by a competent qualified person. The competent Persons Scheme in charge of gas services in the UK is the Gas Safe Register.
A suitably qualified Gas installer can be found here. https://www.gassaferegister.co.uk/
Sweep Safe LTD and trading name Sweep Safe have no association or connection with The Gas Safe Register.