Admin, address question

[Astronomyphilly]

So I've rented a new build house to meet requirements and apply for our Spouse Visa. On the tenancy agreement the postcode b is 6WQ. So we've used that in all documents, correspondence etc.

As it's a new build I needed to get the council to assign a band so I could include that in the financial calculations. They have, but have also confirmed the postcode is wrong, it's listed as 6ZQ not W.

Will this pose a problem? The address is given on thier TB certificates and so forth. It's obviously easy to explain and I shall but I'm also wondering if we need to redo everything.

Am I worrying about nothing here?

Thanks for any input