Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Hard to tell from photo. However, I think it's a fungus not a lichen.
Lichens are typically slow-growing and quite colourful. While I'm no lichen expert, this just looks like an almost colourless bracket-type fungus fruiting-body, growing out of wood.
I've never seen a lichen growing on bare wood, on live bark and sometimes on previously living bark, yes, but not on dead wood. I suspect that since lichens are very slow growing, that bare wood wouldn't provide a good growing surface because it would change too rapidly. The bark has fallen-off at some stage. The growth has followed the grain in the branch.
As I said, I'm no expert, so I defer to someone who knows more about this.
This is a fungus (the non-lichenised kind) rather than a lichen.
Lat/Lng: 53.4, -2.4
OS grid ref: SJ7595