|Residence||Quebec House, Weatherfield Quays|
|First appearance||26th January 1990|
|Number of appearances||1|
|Played by||Gillian Cally|
When the residents started having problems with their appliances, Geraldine investigated the matter along with Stephen Charlton. Working under the theory that someone was using unsuppressed electrical equipment, contrary to their tenancy agreement, Stephen spoke to the various flat residents to determine which one was culprit, and highly suspected Mike Baldwin after an encounter with him outside the building. Calling at Mike's flat, Geraldine and Stephen caught him using an industrial sewing machine, which he was using to complete an order for travel bags for Peter Ingram, who had given him an order unaware that Mike had sold his factory Baldwin's Casuals.
After tetchily being reminded by Geraldine that running a business from his premises was against his tenancy agreement, an unconcerned Mike told them to either help out or leave. Annoyed at his indifference, Stephen called Mike a very unpleasant little man, bringing out Mike's temper, but Geraldine ushered him out of the flat before things got heated. Afterwards, Mike was served with notice to to quit making the bags in the flat, but legal proceedings were slow enough for him to complete the order. However, to be on the safe side, when he got another order he moved operations to Alma's old flat.
- Actress Gillian Cally was credited as "Gilian Cally" in her single-episode appearance as Geraldine.