The postcode centroid seems to be centred on this building, so it would be surprising if there's an error there (although I am not familiar with how they were imported)/

Secondly, and you'll have to ignore the rather... crude... banner on this website. 

https://shitandnotshitpubsinreading.com/tag/ice-house-reading/

It was published 1 year before the postcode was added to the building, verifies the Ice House has a postcode of RG6 6BQ & has no copyright.