p.a means in salary
Well as people have already answered the pa means Per Annum so that works out at Â£230 per week / Â£15 per hour. If this sounds far too much for the job that you will be doing, it could be a typo and will mean pro rata which is the Â£12k divided my 52 weeks divided again by say 37.5 hours which is about Â£6 per hour.