Limacus flavus or maculatus?

Limacus flavus or maculatus?

Observation - Limacus flavus or maculatus? - UK and Ireland. Description: 10cm (when extended) slug, clearly limacus, but is it flavus or maculatus? Appears quite dark, but has a yellow line along most of its body, some dispute about the id. Pictures show a thwarted escape attempt (across the wifes favourite furniture), c

10cm (when extended) slug, clearly limacus, but is it flavus or maculatus?

Appears quite dark, but has a yellow line along most of its body, some dispute about the id.

Pictures show a thwarted escape attempt (across the wifes favourite furniture), close up of the tail end, colour of mucus.

Can it be identified to either species with confidence, or should this be left as limacus sp?