Sounds like a normal british spider - I have been fascinated looking at websites this morning
Found this - thought it might help. Just copied a relevant paragraph.
Spiders are not dirty, but clean themselves regularly and have never been linked to the spread of disease. Most are loners, and the only reason they come indoors is for moisture and humidity, which is why you often find them in the bath but rarely in the bedroom, one of the driest places in the house.
Those we find in the bath are house spiders and among the UK's largest. They can nip if trapped so Dave recommends leaving some loo roll draped over the side of the bath, "then they can climb out and do all those useful jobs in the home. If you wash them away, they'll come straight back. Their hairs can trap air so they can breathe underwater."