Have you considered the size of your market, or lack thereof?
Unless you have a pipeline of clients I can see you working 10-15 days a year in ROI, and being lucky to get the rates you have mentioned.
And while there is no licensing requirement for CP here, I would not like to fall foul of the PSA for providing an unlicensed security service
One can argue that because CP is not specifically provided for in the legislation that it is exempt however, if one looks at the legislation
"security guard†means a person who for remuneration guards or patrols or provides any other protective services in relation to persons or property and includes a person who for those purposes—
(a) provides those services exclusively for an employer who is not a private security employer,
(b) monitors security equipment,
(c) supervises and inspects security guards while they are guarding or patrolling,
(d) accompanies a guard dog while the dog is guarding or patrolling, or
(e) controls, supervises, regulates, restricts or directs the movements of persons, whether in vehicles or otherwise, in relation to any premises or any other place where a public or private event or function is taking place or about to take place", specifically the first line, then it becomes less clear.
There are a couple of firms providing dedicated CP here, the rest will pull in DS and unlicensed ex-mil/Police when the need arises, and generally pay them peanuts.
Food for thought.