Crikey, you lot have been busy!!

Now, regarding the date, if you cast your mind back, I had a stab at this:
Clothes are perfect for 1911/1912. I would say it's GRV's coronation.
I stick by that date. Don't think it's any earlier - deffo not 1905 anyway.
As for the hanging plaque thing, I had a fiddle in Photoshop to try to show it up better. I think it's one solid plaque with a central design, rather than two separate bits. The lighter bit in the middle has the correct perspective to be part of the plaque, rather than the wall behind.
Can't actually help with anything practical yet, but will keep my eye on this thread!

Cheers
Prue