Deadlock letters explained: the key to the UK ombudsman
What a deadlock letter is, when to ask for one, and what to do if your provider refuses.
2 Nov 2026 6 min read
United Kingdom · Broadband & mobile
Internet, mobile and landline providers are among the most-complained-about essential services. Here is who to call, what to say, and how to escalate when the call centre stalls.
Most providers must issue a deadlock letter or let eight weeks pass before an ombudsman will take your case.
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Escalation
Only escalate after giving the provider a chance to fix the issue and keeping a record of dates, reference numbers and evidence.
Common questions
Most complaints are resolved within a few weeks. If the provider has not fixed the issue after eight weeks, you can ask for a deadlock letter and take it to an ombudsman. The ombudsman usually aims to decide within 90 days.
It depends on the provider. The two schemes are the Communications Ombudsman and Ombudsman Services: Communications. Your provider must tell you which one it belongs to, and the name is usually on its complaints page.
Usually only if the provider issues a deadlock letter or makes a final offer you reject. Otherwise, wait eight weeks from the formal complaint. Some providers agree to early escalation, so ask in writing if the case is straightforward.
Playbooks
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