Answer:
When Obi is in England, he misses Nigeria. It is the first time the country becomes "more than just a name" for him. He even writes nostalgic poems about his home while he was away. On his return, however, things are not as he had remembered them, he has been away for almost four years and his memory has failed him somewhat.
On his return from England he went to Lagos, where he has passed through on his way to England as well. As a little boy he has heard of Lagos, of its piles of money, its lights, its cars, its fast-paced life—an image that has stayed with him long after his first visit on his way out of Nigeria. On that first visit he has stayed with an old schoolmate named, Joseph Okeke, who ia a clerk in the Survey Department and who has not had the same kind of education Obi has had and would continue, at that point, to have in England. On that first visit, Joseph tells Obi about the lifestyle in Lagos, and the dancing, and the women. Lagos has made such an impression that it is what he thinks of when he writes nostalgic poems about Nigeria during the cold winters in England.