I have listed some that I have enjoyed and others that I haven’t had the luxury of trying yet. Remember that some can grant bursaries or offer subsidies places. Others may have cut price late availability. Some offer Fellowships that can be applied for online or via your local Arts council.
Of course you can always rent a secluded cottage/barn/caravan and spend the time finding your creative talent. I have found that having other writers on site is helpful. You will meet wonderful people (and some odd balls) that generally are very supportive and interesting to share ideas and writing experiences with.