I watch this with interest.
Anecdata alert.
Around 20 years ago myself and an old school friend planned a circular walk in the Brecon Beacons.
Over a weekend we planned to cover around 20 miles, carrying the food we needed as well as the kit for one night's camping before returning to my car the following day.
To be fair, unlike your costal path walk, we weren't following a path, but were going cross-country using OS maps and a compass.
What we hadn't counted on was how difficult and challenging the terrain would be underfoot. Really, really difficult to make any progress on what, in skiing terms, would be described as mini-moguls, of which there was no evidence on the contour lines of a map.
Added to which, the weather turned on us, delivering torrential rain courtesy of a howling gale, and although we were well equipped and protected from the weather, it exacerbated the already difficult time we were having with the terrain.
When it became obvious that we weren't going to make our planned bivouac site by nightfall, the map came out and we started to consider a plan B.
We figured that if we were to descend the mountain immediately from our current location, we had a chance of making it to a small lake we'd spotted, where there would be a supply of water, and some flat terrain on which to pitch our tent.
The descent was perilous, with the weather not really letting up until we reached the lake, where we pitched the tent, cooked and ate some food and promptly fell asleep exhausted. We'd very obviously had enough that day.
The following morning, we returned to where I'd left my car parked. We were surprised how little time it took us to get there, given that we'd spent the best part of the previous day walking.
When we checked the map, it turned out that by the time we'd reached our plan B lakeside camping spot, we'd walked a grand total of just under four miles.
Less than half of the mileage we had planned for the first day.
The point of this story?
I think we were both quite shocked as to how badly we'd underestimated our capabilities. Neither of us were inexperienced hill-walkers or campers, although it was the first time that we'd combined the two, and also the first time that we'd gone cross-country rather than follow a trodden path.
I'm familiar with bits of the Pembrokshire coastal path, and have camped along it a couple of times when returning from Ireland.
If the weather holds up for you, I'm sure you'll have a cracking time.
