Success is inversely proportional to the quality of the tackle used, buy the wrong tackle for the type of fishing he intends to do will guarantee failure, and he will not carry on it will be chucked in the back of the shed..
A rod is only one part of the stuff he will need to go fishing, a landing net has already been mentioned, he will need a reel and various end tackle, disgorger for taking out any hooks which get swallowed beyond reach of your fingers..
Maybe instead of going out and buying what you think, maybe go on e bay and look on there, you might be able to buy a complete set of tackle from someone who is giving up for not that much more money, and he will then have a proper set up with more chance of success, you really need someone who is a fisherman to put you right on what to buy..
Don't make it a secret, ask him what he expects to be the kind of fishing/fish he wants to catch, if he hasn't a clue get a couple of fishing magazines so he can get clued up, if he knows you have cracked it
And most important of all, make sure he gets a fishing license from any post office or on line to fish in the UK and make sure it is the right type of licence, you don't want to have an environment water bailiff guy checking and he hasn't got one, or he will get a criminal record, that's nailed on.
More to fishing than a rod eh!..