These are the Pokemon nests in Bradley Stoke where we have a report of at least one Magikarp They may have been one offs and there is no guarantee that another Magikarp will appear there

Oak Close

 Stoke Gifford CP2 sightings

Braydon Avenue

 Bradley Stoke CP1 sightings

Little Stoke Lane

 Stoke Gifford CP1 sightings