A few comments / observations from me, some of which are purely a reaction to your current spending spree!
Have you bought a book on basic grading yet? By far the best / simplest is this one
https://www.amazon.co.uk/Standard-Guide-Grading-British-Coins/dp/0948964561/ref=sr_1_1?s=books&ie=UTF8&qid=1468273444&sr=1-1&keywords=grading+coins
None of these are UNC, so don't go by price guides for UNC, at or around EF looks more likely from the pics (even less in some cases perhaps)
You have 14 days to return them for a full refund, whatever the listing states. Ebay will back the buyer in any dispute over that, for distance selling BINs (it's the law)
I would want better / bigger pics of each coin when spending the sort of money involved here
There maybe under 3 hours left on this listing, but in all probability it will be unsold and relisted
(Nearly) every coin / coin lot has a value worth paying, if you got them all for a tenner then that's obviously a bargain, £550 is obviously too much. What is their counter-offer?
I hope that helps a bit!
Personally - avoid and move on
Rob is a recommended dealer and his coins I always find to be accurately graded
http://www.rpcoins.co.uk/