This is a Steatoda (false widow), probably S. nobilis....but it's difficult to rule out S. grossa from the photo supplied.
If the thought of it being in the house bothers you, then put it outside. Bear in mind that these spiders are not deadly, nor dangerous. They are able to bite, but this only usually occurs when the spider is trapped against the skin. They are typically docile, not aggressive, avoiding direct contact with us if they can.
Thanks for the reply'. I thought as much, if there is one is there more likely to be more?
If it's S. nobilis, there are likely to be more in the area, but not necessarily indoors/in the same place. They usually make shelf-like webs up off the ground and hang in them in the evening, so can be quite visible & easy to spot. Females tend to be relatively widely dispersed. Colours vary, can be black with faded markings.
S. grossa (AKA cupboard spider)...again likely to be more of them, these are more widespread than S. nobilis, but very elusive in areas of higher footfall. Wandering a males are more easily spotted.
...colour is variable, this one had just moulted and was a funny greyish colour, but males can be brown with a black abdomen. Females' abdomens become more bulbous as they mature, markings can be subtle or fade entirely, often black/purple-ish body & legs. A very shy spider, mostly hidden away, very rarely a problem.