Unknown Spider

Unknown Spider

Observation - Unknown Spider - UK and Ireland. Description: I spotted this spider out of the corner of my eye yesterday evening. It was fairly large and scuttle

I spotted this spider out of the corner of my eye yesterday evening. It was fairly large and scuttled across my fireplace before squeezing into one of the gaps in the brick work.. I'm not normally afraid of spiders, but this one looked pretty scary! Does anyone have any idea if it's dangerous?