Re: Independent Prescriber administering Botox?
With regard to the cosmetic side,
i think you would have to have a very large catchment area to become profitable or go into partnership / franchise with an existing cosmetic surgery clinic/group - these well may be your main competition as well.
Do you have any inroads into the business? Any connections at all who could shed some light on the procedures involved and the necessary training you would have to undertake?
Make sure you have a lot of solid background info before doing any training, and make sure you have done a good chunk of market research as well. With 'botox parties' becoming more common would you be looking at a supply role or an administration role? Or both?
Would you do an internet trade, and have an internet pharmacy contract, providing web consults and shipping diy kits to people, or would you do face-to-face (groan - sorry for the pun) consults?
Make sure you do your homework properly! It means you will have a sound business plan / strategy for presentation to other clinicians/pct's/rpsgb/investors/business partners.
How will your business approach be operated? Are you simply replicating existing arrangements with private doctors, nurses etc or will you have a unique selling point or angle?
A good idea is always followed by good background work!
On that note i do happen to think that the idea is certainly interesting and could well be profitable - once you have a sound foundation. 
on the note of the vaccinations, training for administering thses is straightforward but you would have to have premises in an affluent area to take advantage of this. Unless you were to put together a team of trained HCPs along with yourself and bid for private vaccination contracts eg private flu jabs.
From what i've seen the market for private immunisation is extremely small as most can get it on the NHS. Some gp practices will administer for free. You could however try undercutting gp's if they were charging for the service of administration - eg gp charges £12 for a vaccine, you charge £5. And you risk ruining an income stream from a gp surgery.
“It's not worth doing something unless you were doing something that someone, somewhere, would much rather you weren't doing.”
Terry Pratchett