Male aged 50,5ft 10 15 stone no known health issues with a Blood pressure of 149 over 112.Is that within normal parameters?

Paul this is high !
discuss this with your doctor

I had high blood pressure that concerned my doctor but I lost weight and got my pressure down.

also
Based on your Height (152 cm) and your Weight (317 kg)
your BMI is 137.2
This means you are in the Very high health risk range
You are over optimum weight for your height and you may be facing health risks
High blood pressure has no symptoms until it is too late !
You may need to discuss with your doctor about a temporary **** prescription to lower your pressure until you can lose the weight through diet or with weight loss surgery or both.

Most adults in the UK have blood pressure readings in the range from 120 over 80 (120/80) to 140 over 90 (140/90). If your blood pressure is within this range, you should be taking steps to bring it down or to stop it rising any further.
http://www.bloodpressureuk.org/BloodPressureandyou/Thebasics/Yourlifestyle

Also you may need a sleep test done to see if you stop breathing during sleep as this can lead to strokes or worse if you have this condition.