I know Wingate itself is likely to have the regulation PE pumps for sale, but they're likely to be quite expensive. All I can suggest is for you to join the two Tenerife discussion forums, www.tenerifeforum.org and www.thetenerifeforum.com and ask on there. I bet there are some people contributing to these forums that have children at Wingate and can advise you where to get the elusive pumps.