In The Long Dark Tea-Time of the Soul, Thor tries to fly from England to Norway and is stopped by a fighter jet.
He then tries to do the same by taking a commercial flight to Oslo and is prevented by bureaucracy.
Ultimately, his goal is to get to Asgard/Valhalla, which means travelling through the "world divide" into another dimension. He does this later in the book.
What prevents him from doing this at the start of the book? Given the difficulties he faces in "our" world in travelling to Norway, why does he not go through the divide and travel there in the other dimension instead?