If the gully has been cracked by roots or by being driven over you might find that the work is covered by your house insurance. Mine was and they are replacing 4 gulleys + several pipes + further repair to the drains - total cost to me £60 excess. Total billable cost was thousands.
Actually it isn't going up much, I checked and it will only be about a tenner. You're right about the costs though, I'm sure they are a little higher than they should be. There is a lot of work to be done though.
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