I'd like to start growing houseplants from seed in the UK. Given that it's almost November, does this make any difference when it comes to growing indoors? It won't be quite as warm, but it will obviously still be a comfortable human temperature in my flat. Or do I need to wait until next spring?
Some plants have a natural annual cycle, but your plants may not be native to your part of the world so that may be either irrelevant or out of sync with your seasons.
Some seeds need a cool "over winter" period (or artificial "stratification" in a fridge) before they will germinate.
Some seeds need to be sown on the surface of the compost and may need the correct day length or light level to germinate.
After they germinate, seedlings may need a relatively high light level to develop properly. (Low light levels causing etiolated seedlings are a common cause of failure.)
You need advice that is specific to the species you want to grow.