Dwarf apple

I'm thinking of extending my fruit patch to include a dwarf apple or pear tree. I've done some preliminary research and found that the variety Lord Lambourne looks particularly appealing (no pun intended!) as it's got the crisp sweetness of a Braeburn but a slightly earlier crop in September. I also found this pear, variety Lilliput which would look very sweet in a patio pot. I've always loved the idea of having an espalier, but that I would have to do at home as my allotment is far too exposed with no available walls to train a fan against. If I ever go as far as to buy an apple, this article is particularly helpful with advice on pruning every year.