Welcome, a couple of nice bikes you have there, should still ride as good as the day you got them.
Price wise it is hard to say for sure, the Roberts being custom made for yourself may limit the market compared to a standard sized one. As others have said, sadly always more value in things when parted out. The components have some nice items amongst them and would fetch £400+ on their own, the frame though nice, is not as desirable as a DB for example, if the paint is original, I assume you have original invoice/paperwork etc then around the £300 mark, again dependent on size condition etc. As a complete bike a bit less, realistically anywhere around the £500 mark. The £2k mentioned above is way off sadly, even for a DB that would be optimistic.
The Orange I have no idea on the market, probably worth as much whole as in parts though.