£8 an hour usually. Nothing compared the risk. Even at the best places, you're looking to spend £150-200 before you start on your own equipment (hi-viz, radio, earbuds etc) then you'll enter a job market that's over-saturated with people, the last few years have seen the market pounded by Eastern Europeans and people from the Job Center who get their QC for free. If you want to earn more, it needs to be a career for you. Find a good national company, large enough to be national but small enough to have a smaller work-force so you're not 1/5000 peons. You'll need experience so sit in a few smaller bars, then once you're ready; Birmingham, Manchester, Liverpool, Newcastle, London, Southampton big bars are generally what you'll find will pay £12-20 an hour based on experience and danger as you'll find people want to stab you more. I had a friend work in South London bars, walked through a bar, checked toilets and came back to front door, shirt was shredded as several people had tried to slice him and his stab-vest protected him.
In regards to your size and gender, a lot of what you'll learn his nerve-holds, basic holds which trap nerves and stops people moving. Long gone are the days of 'beat them til they stop moving' by 6'3 skinheads. But there's still a lot of Misogyny in the industry so you may find closed doors. Some companies will offer 'Definite job after training' while their definition of job is probably more 2hrs on a Thursday night for £5/hr.
closeprotectionworld.com/forum
Is a great forum for all things security.
Good luck.