Wengen ski schools

I've booked a week in Wengen during the Christmas holidays and my wife and I are considering private lessons.

We are both 'advanced' on piste, pretty much able to ski all pistes quickly, confidently and occasionally quite cool-ly - off piste is a different matter!!

Can anybody recommend any ski schools operating in Wengen with a focus on (affordable) private lessons or maybe a small group to learn how to get off piste and enjoy some of the fluffy stuff??

Thanks in advance.

I've used Swiss Ski & Snowboard School a couple of times, group & private. No problems, good instruction, would recommend them. Also used Buri Sports out of Grindelwald. Not sure that they cover Wengen though.