Often these shadowy glimpses of the past are all we have left of industries once operating in our locale. The one here is from the rear-side of the garage in Whitley Park Farm Lane in Reading. We can see that O Phillips and Son was a builders and decorators, with sanitary, plumbing and drainage repairs. However, with the library currently closed access to the local historical directories is limited so more details will have to wait.
If you like ghost signs then The History of Advertising Trust has a good selection to peruse; a number of Berkshire signs are included.