Replacing roof shingles?

I have a lean-to kitchen roof, presently covered with felt underlay and felt shingles, approx 22 sq m. This is now failing and I plan to replace it with similar and I am looking for advice on the best underlay to use, breathable or non, and the best way to fix this.

Also where is the best place to buy both, underlay and shingles, Wickes or a specialist supplier?

Regards

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.newman
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meow2222

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