Hi Jamie
Great question. If your after a business plan then you only need to look at any franchise. Why dont go alone and have a chat to any UK based franchise you don't have to tell them your position but if you ask the right questions you should get the answers your looking for.
Now if you mean "Marketing Plan" Then Direct Response marketing is the way to go. I would look outside carpet cleaning for people into this type of marketing as their approach will be fresh to carpet cleaning. I did this other way around when I had my maid service, i got ideas from carpet cleaning and used them in my maid service with great success. No one else had ever used this type of marketing with a maid service before so it was new and fresh.
Good Luck
Ian Harper