Go to Companies House and look up companies with similar names on Webcheck. There's a lot of companies with very similar names that have either been dissolved or have not filed accounts. (D stands for Dissolved). A lot of them seem to share similar London addresses as well.
In addition, Security Management Recruitment is not a limited company.
I've not done any real research, but at first glance it doesn't look hopeful.
I had a look at secmanrec a few months ago they wanted £100 to follow through with my application. I don't think it is a real company.
If you want into the close protection life i have a contact that has just won a AP contract and needs 64 guys ramping up to 120
Email me firstname.lastname@example.org
PM me if you want details of MARSEC work. I am currently working for one of the bigger companies, and will be able to point you in the right direction re C.P or MARSEC work, if you need any advice please get in touch.