The message
from Andy Clews contains these words:

I have a fairly mature Christmas Cactus in my office and it had lots of
flower buds appearing on the ends of each 'frond' (for want of a better
word). However, all the flower buds stopped growing and dried up when they
were no more than about 5mm long. The plant appears to be healthy and is
watered reasonably regularly, although sparingly at this time of the year.

Anyone know of any reasons for the plant to change its mind about
flowering? Another plant in the office (from which the 'failing' plant was
taken as a cutting a couple of years back) flowered fairly prolifically in
late November and has much the same care regime.

Once the flowerbuds have started to form, they hate being moved and
will often drop all the buds in protest. Could that be the cause?

Janet