The older version, which had the 'tab' style design on the tube, had a heavier texture. The newer version, with the 'wave' design has been okay up to now, but as mentioned previously, the watery texture may be a one off.
I contacted RSC (Potter & Moore), and left a message. Unlike most products which have a customer care freephone number, the RSC don't, and sound a bit formal with their incoming call greeting. I'll e mail them to see what happens.