I know a little bit more. Her name appears to be Lucy Blue (not sure if this is just a stage name) and she is currently appearing on the auction channel bid-up.tv (647 on Sky Digital) normally around lunchtime onwards as an auctioneers assistant. Unfortunately bid-up.tv haven't put any info about her on their website yet, shame I think she's cute! (sorry, had to get that in there!)
Just a small update on my previous answer. Her name is actually spelt Lucy Blu not Blue! Also bid-up.tv will be updating their site in the near future to feature the lovely miss Blu so keep your eyes on their site which is www.bid-up.tv.