Advice from beansandherbs - my underlining:
Regularly mist the leaves with water very early in the day. This helps the fruit to set. Do not water the leaves when they are in strong sunlight. Keep the greenhouse well ventilated.
Once the fruit starts to form, change to a high potash feed, such as a seaweed-based tomato fertiliser and feed every 10 days. At this stage give enough water to stop the roots from drying out,
but be careful not to overwater.Peppers need a long growing season and can be ripening well into the autumn. If a frost is likely the plants must be protected with horticultural fleece (purchased by the metre).
Harvest
Pick immature pods to encourage cropping. Chilli peppers can be harvested green for mild flavour, or yellow for a bit hotter, or left until the heat has developed. At the end of the season, if frosts are forecast, the whole plants can be uprooted and hung upside down in a frost-free shed or greenhouse. The peppers will continue ripening.
http://www.beansandherbs.co.uk/tipspeppers.htmInteresting that bit about uprooting the whole plant and hanging it upside down if the fruit still isn't ripe at the end of the season - I suspect many of us will be giving that a go!
RHS 2006 report on varieties but doesn't give much growing advice:
http://www.rhs.org.uk/Plants/documents/PeppersBulletinHI.pdf