Pleased to report that so far, all of the cacti in the greenhouse have survived the winter. However, it's only when the temperature warms up will it be known what damage has been done. Updates soon.
Peat Free Compost Trial
After being asked on Twitter whether the soil I use is peat free, (it hasn't been), I decided to trial some peat free compost. I purchased a bag of Sylvagrow and am now seeing how the cacti develop:
