I have received a request for help from a really nice Guy in the States called Hunter Phillips. His special hobby is restoring and building scale model marine craft and the one he is currently working on is a relica Imperial Airways flying boat tender. Here's what he has to say:
Hello, Bryan:
Thank you for your note!
Since I emailed you, I was able to spend some time on your site – and between the forum, links, and links of links, I have learned a lot more. What a resource!!!
The British Powerboat RAF launch you provided the photo of is similar to the BPC 37’ Imperial Airways launch that I want to restore my model hull from the UK as. What I want to model is a civilian tender – either prewar IA or BOAC colors.
Seawings has more than enough black and white photos featuring BPC passenger launches that I think I have enough reference for the construction.
The big challenge is the livery. Looking at the launch in the foreground in the attached photo from Seawings, it’s pretty clear that most of the superstructure is varnished wood. And it appears that below the boot topping, the hulls are white. But the waterline color, main hull color, cabin roof color, and lettering are mysteries.
What I need to find is a color photograph, a retiree who remembers, or a color IA or BOAC color poster that depicts a tender.
There is an IA poster by Brenet showing passengers boarding Canopus with a BPC tender along side (Inside cover of the current “Airliner Classics” magazine.) In the illustration, the hull is painted the same mid/dark blue as the lettering and registration on the “C” Class flying boat. In fact the tender livery in the poster looks like it might be the same as the launch at the top of the photo below. Why IA had two different liveries for their BPC launches at the same time as shown in the photo – I have no idea!
Welcome any further suggestions – that’s as far as I’ve gotten.
All the best,
Hunter
Me again: Here is the picture he sent me:

Ok, so can anyone help him?