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Red spider mite can be a real problem in a hot conservatory. Have a look at our advice on how to deal with it. Do raise the humidity as you suggest. This should help, but I've know it to live quite well in humid places as well as dry ones. You can spray your plants with SB invigorator as recommended in adam's latest blog. That keeps them at bay. Also try giving the conservatory a top-to-toe clean out every winter.
As for plants, bougainvillea should suit your conservatory.