If your in full time employment then go to the bank and ask to borrow 10k to buy a car........not to start a business. If your credit rating is good a bank will easily lend 10k to buy a car.
Otherwise you could get a couple of personal credit cards between you and easily get 10k........interest rates will be pretty high though so you've got to decide whether it's worth it.
Just make sure when approaching lenders you don't tell them it's to start a business.....tell them it's to buy a car, home improvements, debt consolidation......anything other than starting a business.
If your not in full time employment then get a job and save 10k.
Good few years ago I received a loan offer from Barclays "borrow up to £25k, typical ~7% APR", thought "great, I can probably invest and get return better than 7%". Tried to apply online and one of the fields was "Purpose" with a list including wedding, holidays, car (essentially "consumption") but no investment type of option. Decided to pay Barclays a visit. Very nice lady invited me to a room and after the initial chat it went more or less along these lines:
- So, I'd like to borrow £25k
- Sure, let's have a look - what's the purpose for this loan?
- Investment
- Oh, I'm sorry we don't lend for investment purposes so won't be able to help you
- Hmm, why not?
- "we don't"
- You know what, I think I've changed my mind, actually I'm going to spend it on my wedding and honeymoon
- But you said "investment" so I don't think we can proceed
- I'll use the wedding money I have for investment and this loan will be for wedding wedding
- Ah, that's ok
30 mins later got £25k @ 6.9% :|
Couple of points which I'm still puzzled about:
- they were ok me to flush £25k down the drain (from ROI perspective

) but were not ok me to risk that money and have even a tiny chance of making some money out of it? Even if the investment idea was the craziest one in the world, probably still safer than pure consumption? :|
- why do they ask for purpose - the loan is unsecured and nobody checks it anyway? Why bother?
Well, the final was that I got nice ROI and paid it off earlier.
To OP - if you have a good credit history, that might be one of the options to consider, alternatively you can try crowdfunding - some communities do not require giving that money back.