Where about are you based?
In most major cities there are quite a few Islamic instituions which teach Arabic:
In Birmingham for example there are institutes such as Faizan E Rasool who have classes for male and females. Students have gone to places such as Yemen, Syria & Egypt to study further.
Arabic for women only (every thursday 6-8) The Amina Trust 1 Jenkins St, off Coventry Rd, Bham. Tel: 07980 957 709.
Others include Sultan Bahu Trust, Kanzul Huda etc:
Check the link for address details: