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Get some small pots and some compost and follow the instructions on the packet to plant them. Leave them inside for now until they've germinated and are growing nicely, then gradually harden them off by leaving them outside during the day, but bringing them at night for a week or so.
Then once we're into the middle of May you should be able to plant them outside and see how they get on. The tomatoes should be fine, not sure on the red peppers or cucumbers. We're trying the latter for the first time this year, but have had no luck with red peppers in the past.
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