Glider Towing Rating ..
Wageslave is right .. .
In the vast majority of cases tug pilots in UK gliding clubs are very experienced and current glider pilots, and for very good reason. Only in the very small clubs might this not be the case.
You have to know the gliding environment well in terms of where the air is going up and down, drift, and the general operation. If you don't have the solo soaring and handling experience you can't appreciate what the bloke/bird on the end of your rope is looking for and dealing with.
It might look like towing is merely ploughing through the sky, but there's more to it than meets the eye. And what you do has to be tailored to the type of customer and the conditions on the day - from trial flight wooden ship to competition launch of heavily ballasted open class glider.
In the decent gliding clubs in the UK towing pilots are glider pilots with PPLs in the main, not PPLs who have done a bit of gliding. There are lots of risks and 'needs' attached to towing and they have to be understood by someone who knows and understands the sport.
If you're interested in towing in the UK you'll need an interest in gliding and soaring, and a willingness to become part of a club and 'do your bit'. Whatever the EASA bloke in Cologne has dreamt up with defining a towing rating, that isn't going to change how clubs manage that aspect of their operation.