Two Excelllent slips I know of there are
1) Ilfracombe lifeboat station. (shared slip) parking can be a pain.
+ or - 3 hrs high water. Launches into drying harbour and then Bristol Channel
2) Appledore Public slip. This is excellent, free except the parking which is in the same place as the slip. + or - 4hrs high water.
Launches into River Torridge. Go up river for Bideford or out over Bideford Bar to Bristol channel. Lundy Island is a nice place to visit approx 20 Miles from Appledore. Do your homework as regards to the Bideford Bar as it is can be dangerous if you don't follow the channel out!!
There is a lifeboat station at Ilfracombe and also a lifeboat is permanently moored off of appledore.
I think Swansea is nearest radio staion but please check.