Please Help, Was This A Good Deal

It's hard to tell condition from your photos, but assuming that they're all pretty much in uncirculated condition (which they should be as non circulating coins) then you've done rather well. Ignore Alderney and T.D.C. Check the retail prices here:

http://www.coins-of-the-uk.co.uk/values/deccr.html

The online World Coin Price Guide lists only one £5 coin for Tristan da Cunha, for 2008 and both are silver - see https://www.NGCcoin.com/price-guide...duid-1561598 and https://www.NGCcoin.com/price-guide...duid-1563293 . The values are similar.

These 5 pound coins are very difficult to find the US as I have only found 3 or 4 at my local store. Paying face value is a great deal - if you end up wanting to sell them, you should be able to exchange them at the bank if no one else offers more than face value. I would be thrilled to find that many of them here.

I went to England two years ago and brought a duplicate 5 pound coin to the bank. The teller was a little confused initially and asked the manager if they could take it. They said yes so I ended up with a 5 pound note. Thanks for sharing these beautiful designs!

Face value is usually a great price to pay for anything... its like a free no-lose bet.

Then some guy spent fortunes on commemorative £5 coins and kept banking them in some online nectar point system. The banks then said they didn't want to take them.

I am not sure how the land lays now in regards to this but pressumably if you ever wanted your money back you would be able to somehow.