“I will also be interested to hear people's experience of this. I am producing an educational book this year and will need to seek investment at some point.
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This day and age, it's never been easier. Have a look at crowd sourcing. If you have a genuinely good proposal, then go to someone like crowdcube.com
Otherwise its the more traditional route of flirting with various angel investors.
Either way, make sure your business plan is first class, the numbers add up, and you can handle the pressure of having outside people having some of your equity. Plus you must have a clearly defined exit strategy, as most investors are looking for a clearly defined return.
But raising money doesn't have to come from investors, why not keep your equity and get a bank loan. If your business plan stacks up, regardless of what the media are saying, banks are lending money.
Another route is crowd funding, similar principle to crowd sourcing, ie the power of the crowd making small investments, but this is a straight forward loan, so no equity loss. Check out fundingcircle.com becoming more and more popular with small businesses.