recommend some fruit tree varieties

Wouldn't like to suggest apples as I have a few but I picked them from "The Apple Book" and from walking round Brogdale and eating a few there. Varieties Like Holstein, Orange de'Sonneville, Karmijn de'Sonneville, Nutmeg Pippin. Very nice apples but not the normal varieties, I had mine grafted by Brogdale.

Plums, Kirks Blue, very nice. Oulins golden gage is another I have and good.

Cherry's, I have Sunburst, very nice but cherries are also liked by birds and you will not get many.

Peaches/Apricots/Nectarines: Really need a sheltered south facing wall to grow them against, we just do not get quite enough sun and heat for them. Some years we might and they will be good, other years they just do not ripen. Rochester seems to be the standard peach for the UK. However check round as there may be newer varieties.

There is an apricot called Tomcot that is reputed to be good for the north, so it sould do well in Oxen. Whatever variety get an Early types as that allows them more of our English summer to ripen fully.

Never grown pears except for asian pear's - Kumoi, cannot suggest anything from experience. Pears are reported as taking some time to fruit.

Try a Spartan apple tree, you will not regret it.

Thanks everyone - lots of good advice 

Thanks everyone again for the good advice. Thank you especially SG6 for posting the link to the orange pippin website. It's a great website full of information and they have been extremely helpful and patiently answering all my questions. I've now put in an order with them for 2 apples (James Grieve and Fiesta), 2 cherries (Stella and Penny), 2 hazels (Gunslebert and Lange Tidling Zeller), a damson (Shropshire Prune), a plum (Haganta), a green gage (Cambridge Gage), a pear (Beurre Bosc) and an asian pear (Shinseiki). 

I can't wait to get them