Insect and Spider Identification: House Spider, or some kind of new Species perhaps? (ID?), 1 by Rockyz

Rockyz wrote:
Before taking a shower, I needed to turn off a running tap. Due to this, I had spotted this strange spider - Shiny back sort of. With greyish kind of abdomen. It was hard to decide what it may have been. Although I am 100% certain it's a Female. Due to my recent knowledge of spiders...
(What do you guys think it is?) - Luke

Update: Although it could also just be mistaken for a Mouse Spider. It most likely would be a Amaurobius similis. However when disturbed it didn't do anything apart from scatter away. - What I'm saying is don't Amaurobius similis show some kind of defensive movement. - If not, then sorry. - The spider really has me interested, it looked different to other spiders I've encountered in the Bathroom. - So hmm...

I think it might be this: Mouse Spider (Scotophaeus blackwalli)

- Although, if this is a new kind of species - it would be amazing. Or even if it's a new Alien Invader from a different part of Earth. - We've had some Alien Invaders lately. - False Widows and even Tubeweb Spiders. - Mouse Spiders aren't that common in the UK though... so I'm not too sure :S