National Grid are currently running a consultation on their policies relative to running cables underground. I hope that you will take the time to look at the consultation paper and respond. The link to the consultation can be found here http://www.nationalgridundergrounding.com/.
Given that North Wales has been selected as a site for a new Nuclear Power Station on Anglesey it is vital that North Wales residents write and give their views on underground cables, particularly given the importance of the tourism and agricultural sector here in North Wales.