Not sure there are many places even paying £20 per hour, 15 to 20 is far more typical.
The other thing to note the minimums to teach CPL are not necessarily the experience you will need to actually start teaching CPL, with the stagnation in recent years with many instructors not moving onto the airlines at the rate they once did, then there are plenty of high hour instructors out there; so you are not going to get looked at for CPL instructing until you surpass some way in excess of the minimum requirements.
Pay rates for teaching single engine CPL, I have heard are around the 25 to 35 pound per flight hour. If singe engine vfr instructing is really what you want to do you many find better pay rates teaching on fixed axis micro-lights.