Thanks for the replies guys!
It's a community project for the village here in the Highlands funded partly by Better Broadband Vouchers and money from the community council received from the wind farm. I think to keep the costs down the householders are responsible for digging the trench within the property. He said that they would leave me the cable for me to put in the trench.
I don't have to go under a path or drive as it's straight up the garden. I don't think that there will be any ducting as this is from the letter:
"This offer is possible due to a new method of armouring fibre optic cable which means that expensive ducting is no longer required - the cable can be buried directly in the ground."