VA:
I'm sure you understand that it's impossible to accurately estimate values from a few photos, especially with double rifles. Too many variables.
A few observations.
The Woodward "Automatic" is not common, especially in double rifle form, so comparable sales aren't easy to find. Likewise original Fraser double rifles.
The Purdey is in a desirable caliber, but the underlever models won't bring as much as the toplevers do. Likewise, the side safety is very unusual, and probably a negative as well. Champlin's has a Purdey UL Snap Action in .303 in excellent condition for sale currently at $35,000. Assuming similar condition, a .450 No. 2 would be worth substantially more.
The Holland should be pretty easy. Haven't seen a Royal .303 trade recently. I did see a very nice .500/.450 NE Royal trade not long ago for $50,000. The .303s are popular now, but they don't bring what the larger bores do.
