I became really good friends with my instructor & we have since kept in touch. I've been round to his house for a chat (mainly to show off my driving skills in the early days after passing, haha, he lives in a village with a lot of tight one-way country roads!), we keep in contact via text, meet up for coffee, did Pass Plus with him. It's really nice actually, he frequently asks me how my driving is going & it's wonderful to know he still cares. When learning he told me I was his favorite pupil & he actually chose me out of every one of his other pupils for his check test too! Got him a box of chocolates & a big thank you card as well. Also friends on Facebook!
I know it seems strange that the 'relationship' didn't end when I got out of his car after he dropped me back home after I passed my test, but I'm happy with things the way they are. ^_^