Hi
Don't live in Manchester so cannot help there, sorry.
I agree with bacon that 1 advert in 1 mag isn't enough, it really does need to be ingrated across different types of promo. If you are going to spend money, I am not sure that advertising in print should be the first thing you do...
If I were you I would (you may have already done this)
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Create a website so you have an online business card. There are lots of older threads on here about how to build your own. Search engine optimisation might bring you leads. Plus some people may want to check your creds out.
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Try to list/promote yourself online as much as possible. There are lots of free places where parents spend time. Plus google places, Yell.com etc
As bacon* says noticeboards are good too. But revisit them, they are cleared often.
- Think about people that can refer you and contact/network with them - Doctors, alternative health centres/shops, NHS services etc, charities that deal with young people, schools etc.
This probably feels like too much, but I would also think about how to promote yourself as an expert. Could you write to the local paper/parent mag offering to write a "Children's Expert" or whatever. This sort of thing does take time, but it can really reap rewards and it is something you can add to your website etc.
You could also do taster sessions/groups which don't make you money but could introduce to people that are interested in what you do. "Understanding child therapy; is it for us?" Join us for an informal session where Fotherespie, experienced local therapist will talk you through how child therapy works and what you can expect." etc
I would also look at what your competitors are doing. Assuming they are succesful, whatever they are doing is obviously working!
Good luck.
Abby