Well an update to my car is the warning lights for the TPMS have all been successfully turned off without me actually doing anything!!!
Honest truth is that I tried to get a Terraclean service done to the car but unfortunately was not able to do it as the car would not run on the engine long enough because it kept switching to electric mode. Probably had something to do with trying to trick the fuel supply by making the engine run on the terraclean machine.
As the above had failed, all the warning lights of the world came on including check hybrid!!! To say I was annoyed was an understatement. Luckily the guy who came to do the job had an ipad installed with some software and an obd scanner that read to it. Could have been techstream or something else, I didn't know tbh. He cleared all the warning codes from the car and managed to clear the TPMS warning lights at the same time. They have now been off for a week and have not come on, the car has been driven for 250 miles and still error free, apart from the EML light which was on before as well (basic scanner read both crankshaft sensors). I still await for the arrival of the warning lights so will post again if they do come on. I will be purchasing the techstream and installing it onto my laptop. If the error does come on again, I will follow Britprius's advice on how to replace the batteries.
Thank you all for your help so far.