Bringing chillies/peppers indoors

bring them in and keep them somewhere warm and as light as possible. carry on feeding and watering until the fruits are ripe and then picked.
Then ease up on the watering and stop feeding.
Give them a good prune and again if poss move them somewhere that's light but a bit cooler, so they just tick over for the winter.

In the spring tip them out and pull off any loose compost that you can, and repot.
Give a little more water and bring them back into the warm, so that they start to grow again.

I kept mine in the spare bedroom and then brought them down to the kitchen and had a tremendous crop this year. Good luck!

I seem to remember reading somewhere that if you pick the green chillis, thread them up in a ristra and hang them up indoors in the warm they'll turn red like that, and subsequently dry out. Has anyone ever tried this?

Yes!  I spent ages during my first year two years ago threading chillis carefully alternating the red, orange and green chillies.  It looked very nice!  Put them in the airing cupboard to dry out (don't think you have to do this though) and then when I looked at them a few days later they were all red!

I am going to try to overwinter some chillies this year as trying to grow more and more each year.  Went to the garden centre 2 weekends ago and they had a chilli festival.  It was a great idea and they had cooking, chilli products and lots of chilli plants at 3 for £10.  Silly customers I said, they won't last long.  Then I found myself walking out with 3!  I will have a go at overwintering them was my justification!

What's a ristra?

I seem to remember reading somewhere that if you pick the green chillis, thread them up in a ristra and hang them up indoors in the warm they'll turn red like that, and subsequently dry out. Has anyone ever tried this?

We've been using them, green off the plant, regularly since early summer and now have a lovely little Ristra growing too as we pick them ripe.