Brian Reay presented the following explanation :
We dont use ours much but, going by others comments and the odd time we
tried our previous one, the temp control tends to be poor as does the
insulation.

We use ours for almost all main meals eaten in. One small oven is a bit
restrictive, but we have managed full Sunday style roast meals in it,
without too much bother. I don't have/ don't like microwaved food,
other than for reheating.