Yes, the tomatoes and geraniums were in for a (pleasant) shock - I had decided to install a wood-burning stove in the conservatory!
Here we see part of the rather grand chimney - the part which would be inside the conservatory. When the fire is lit this gets quite hot as the stove has an output of 5KWh.
In the past the conservatory was really only comfortable for 6 months a year (April - September) and the tomatoes struggled to ripen during October. I found it hard to sit in the conservatory between November and February which was a pity - as it is my favourite room in the house. The new wood-burning stove is intended to make the conservatory comfortable all year round.