Adam
having a wide knowledge in cleaning will serve you well. I did City & Guilds In Cleaning Science. not sure if BICSc still use it as they have lots of their own courses now. I checked City Guild site and found this
http://www.cityandguilds.com/qualifications-and-apprenticeships/built-environment-services/cleaning-services/7648-cleaning-and-support-services-skills#tab=informationagain not sure if its the same as mine i did 764 and this one is 7648
I have never seen or been on a one day course that shows how deterrents work and this is key to effective cleaning and choice of products.
What is great about BICSc is they understand the different education levels of people in cleaning that are supervisors and mangers and help is at hand for those that suffer like myself. Year one is multitable choice with a presentation and course work that is done by post. second year is writtern but in my day they would put someone with you help with writing and spelling.
So city and guilds in cleaning science is within anyone's reach. and is so much more than any one day course that can be about selling their products and machine to you. not saying these courses dont have value but some are questionable.
also personal membership of BICSc will say so much more on your CV plus you get letters after your name how cool is that for a cleaner? -)
BTW Prochem is a great course money well spent. you need to do them all