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It is a tick. Lizards can get lots of these and they seem to accumulate behind the foreleg as this is the only place the lizard can't bite them off.
Thanks Masked Marvel, I never would have thought of that- why it is where it is, I hadnt considered lizards as tick hosts either for that matter.
Could it be a regular sheep tick? Sheep ticks are common on that land.
Not a tick expert (maybe post in invertebrates?) but I think that most ticks that affect reptile are sheep ticks, although I'm sure I've seen some lizards with what looks like different species.
Lat/Lng: 55.0053, -6.0328
OS grid ref: NW422752