I photographed this Forest Gate sign in May, having spotted it from the bus. Like its counterpart in West Norwood, this is an example of preservation by hoarding: the older image on Google Streetview shows most of the surviving paintwork covered by an advertising poster.
Here is the familiar blue-and-yellow BryMay logo; the only clearly legible wording to survive is 'BryMay Safety Matches'. However, there are traces of wording to the bottom left which, can just about be deciphered as 'save the panels'. This exhortation also appears on the BryMay sign in Alpha Road, Deptford.