Looking For Work Volunteer weekend work and holidays

Hi, I am looking at changing my career. I have previous experience of working on a sheep farm when I was 14 to 16 but decided to go to university and teach. I am 25, have a business management degree and currently teaching. I would love to get back into farming. I am willing to work for free on the weekend and during my holidays because I want to gain more experience in order to leave teaching and return to farming. Willing to travel anywhere in North Wales or Chester.