Doing it right this time, I ordered the Structural Gauging Train Decal Set from Railtec and used departmentals.com to find out which number on the sheet was the BFR which ended up being 99666. Using this I gathered references for where the decals needed to go and on which side. On one side I used a steel ruler to scour a small line under the correct window at the height of the current Network Rail text and on each side of the original running number, these would act as references for me to correctly position the new decals.

I took a toothpick and applying a medium amount of pressure, scraped off the original logo and running number and placed the new ones using Humbrol DecalFix using my scours as guidelines.

Also included on the sheet were the information panels on the ends of the coach and using more reference photos I found the correct ones and the proper placement for them. I had already painted the windows by this point so I made sure the correct positioning was on the correct end.