I knew one hypnotherapist in London who dressed up as a cigarette (you could say fag, but that has other connotations - no offense to anyone here
) and handed out leaflets on hypnotherapy and smoking cessation.
Another one dressed up in a fake police outfit (obviously not too realistic - that could have legal problems) and advertised himself as the "Stress Police" (his trademark I think).
I know Bristol has loads of therapists, and I have some stiff competition there - people are unwilling to pay £70 for past-life regression (oddly, what I've had the most requests about as I am registered as a past life specialist on GHR's website) when holistic centres offer it for half that price.
I have been seriously considering emigrating to the Canary Islands (Spain), especially Tenerife, and to try and start a hypnotherapy business there specialising in smoking cessation.
I know the red tape there is pretty awful for ex-UK residents starting their own business, but once I get round that (and possibly do some local unskilled work in the meantime), the competition there actually seems to be somewhat less from what research I've done - there seem to be few hypnotherapists on the island, and plenty of (English-speaking) smokers willing to quit.
Tenerife has a forum for people thinking of starting business or getting a job there, which I've found helpful - a lot of people there find my line of work interesting, and have stated that they are looking for just such a therapist...
I don't have that much experience in running a business, nor do I have that much capital (cited as a main reason why new businesses fail over there), so I'm wondering if such a move would be viable.
On the other hand, handing out 1000+ flyers, dressing up as a cigarette on the street, offering free (or cheap) talks locally, and referring from other local therapists (and even beauty and fitness centres) seems a fairly inexpensive marketing technique. Possibly some stategic advertising too once (or if) I get some cash, might go down well...