No interactions present.
This looks fairly close to wild-type Dahlia coccinea, but has semi-double capitula.
There is a seed strain, 'Bishop's Children', derived from 'Bishop of Llandaff', which is quite variable. Apart from that the closest variety I know is 'Edith Mueller', which however has flowers somewhat more towards orange.
Lat/Lng: 52.9424, -1.1995
OS grid ref: SK538386