Cancel your Diamond Car Insurance subscription by mail
For Diamond Car Insurance the route is a written letter: cancellation requests are taken by post, and certified mail shows when yours arrived. Diamond Car Insurance receives written requests in Cardiff, United Kingdom.
Let Postbye cancel Diamond Car Insurance for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Money-back guarantee within 10 business days.
Postbye is not affiliated with Diamond Car Insurance.
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- 2 Diamond Car Insurance cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Diamond Car Insurance by mail
Start with your account details
Diamond Car Insurance will look your account up from what the letter says, so check the policy number, the registration number of the vehicle and the date you want cover to end first.
Write your request
State plainly that you want the Diamond Car Insurance account cancelled, further charges stopped and a written confirmation sent to you. Postbye sets this out in a ready English template (“Subject: Cancellation Request – [your name]”).
Send it by certified mail
Take the letter to the post office and ask for certified delivery to CF10 2EE Cardiff. Keep the tracking number it gives you.
Keep proof the letter arrived
Delivery confirmation is your evidence that Diamond Car Insurance was asked. Watch the next statement or two for any further Diamond Car Insurance charge.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Diamond Car Insurance cancellation letter goes
Diamond Car Insurance can be reached by post at David Street, CF10 2EE Cardiff, United Kingdom.
Copy the postal code CF10 2EE exactly: it is what routes the letter to Cardiff, United Kingdom.
The letter greets the reader with “To Whom It May Concern,”; your own details sit under the labels Account holder, Billing address on file and Email on file.
Prefer to write it yourself? Use our letter template
Every address we hold for Diamond Car Insurance, with the envelope wording
Before you cancel Diamond Car Insurance, check these
- Some insurers need proof of the new cover or a statement that the vehicle is sold. Ask what they accept and send it with the request.
- Do not cancel until the new policy is active. Driving uninsured, even briefly, can carry fines and penalty points.
- Premium paid for the unused part of the term may be refundable, sometimes less an administration fee. Ask how it is worked out.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Diamond Car Insurance for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Cancelling a car insurance policy
Car insurers cancel by policy and by effective date, and a gap in cover is a real risk, so the request has to name the vehicle and the exact date cover should stop, ideally after the new policy has started.
A mailed letter is slower than a phone call but it is the version that proves what you asked for and when.
Diamond Car Insurance cancellation at a glance
- How Diamond Car Insurance accepts cancellations
- By mailed letter
- Mailing address on file
- Diamond Car Insurance David Street CF10 2EE Cardiff United Kingdom
- Country
- United Kingdom
- Letter language
- English (template en-generic)
- Category (from the company name)
- Car insurance
- Added to the database
- May 7, 2026
- Data last checked
