You've made over 100 edits which copy the data from DoBIH into OSM. Their copyright page states that use of the DoBIH data needs to clearly give attribution to DoBIH where the data is used. OpenStreetMap cannot do that — all it has is “© OpenStreetMap contributors” as a link in the bottom. It would need something like “© OpenStreetMap contributors and The Database of British and Irish Hills v18” to comply with their attribution requirements.

Accordingly, as I understand things, DoBIH data therefore cannot be used in OSM without a waiver which says they’re happy to waive the attribution requirement.

Given how popular and useful OSM is, I imagine the DoBIH people might be amenable to providing a waiver. Have you spoken to them about it?

If you think my interpretation of the licensing is incorrect, you could raise the question on the imports mailing list (https://lists.openstreetmap.org/listinfo/imports).

Ta :)