Bike hire in Devon or Dorset

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Thinking of a family cycling holiday in Dorset/Devon UK next summer. We'll be based at Lyme Regis.

I'm looking at costs of flying bikes over vs renting there.

We would need light touring bikes, triples, with light baggage racks, for two
adults and two preteens, preferably tiagra quality or higher. Any
thoughts?

Is it conceiveable we might hire in London after landing and take the train to Lyme?