Property law in Scotland is different than in England & this looks like a tenement (which usually doesn’t have a management company as in England).
If another owner in a Scottish tenement is preventing you from accessing a shared garden, there are a few key steps and legal principles to consider:
Check Your Title Deeds (and Feu Disposition)
Look at your title deeds to determine:
If you have a legal right of access to the garden
If the garden is shared or exclusive to specific flats.
If there are burdens or servitudes (legal obligations or rights affecting property use).
Check the Title Sheet of the Other Owner
If you can - check their title as well to see if there is any clear indication of rights or exclusivity being claimed.
Tenement (Scotland) Act 2004
This governs rights and responsibilities in tenement buildings.
Shared areas (including gardens) are presumed to be common property, unless deeds state otherwise.
All owners generally have equal rights to access and use common areas, in a reasonable manner.
If they are still preventing access:
Start with a written request (keep it civil and factual).
As a last resort, you can go to the Sheriff Court for a declarator of your rights and an interdict (injunction) against obstruction.
Good luck 🤞