I see that I posted my review of The Dervish House just an hour before I started to read the 1977 Doctor Who annual (included on the DVD of The Hand of Fear). It is a pretty quick read - 78 pages, but a lot of them are filler. As with the 1976 annual, I found the artwork really striking, apart from the depictions of Sarah Jane Smith and Harry Sullivan - though the artist, whether Paul Crompton or Glenn Rix, is getting a bit smarter about this and tries to make a habit of showing them from behind or in shadow - did the BBC simply not provide him with any publicity shots? However his Tom Baker is excellent (see right for an example).
Apart from the artwork, though, the stories are much blander than the previous year's, and the factual filler stuff is exceptionally basic information about the history of space flight and astronomy. It's slightly longer than the 1976 annual, but if anything slightly worse value.