Sorry @Jf20 I think your post is well intentioned but misinformed.
Here is an example of a NWNF Conditional Fee Arrangement:
If you are unsuccessful you pay nothing and the lawyers get paid nothing.
If you are successful:
Let’s say the compensation you are awarded is £100,000.
The lawyers fees are £35,000.
The lawyer recovers their fees (provided a judge considers them reasonable) from the other side.
The lawyers charge a success fee to you which is 25% of your compensation (which is the maximum a success fee can be).
So you pay the lawyers £25,000 and take home £75,000 for yourself.
The lawyers total take home is £60k (their original fees of £35k paid by oppo plus £25k success fee paid by you).
Regarding the insurance policy…
It is quite standard for lawyers to ask you to take out an insurance policy in the event you are unsuccessful as this covers any fees incurred such as medical reports and court fees.
It won’t usually cover the solicitors own fees though as claimed further up thread though which is ridiculous! I think @Jf20 said that your lawyers get paid either way - that is totally incorrect! NWNF lawyers are taking a real risk that they will get paid nothing, that is why they are allowed to charge a success fee to claimants in addition to recovering their legal fees from the other side when they do actually get in as this balances the losses.
The only way Claimant lawyers get paid irrespective of the outcome is if you instruct them on an hourly rate which perversely is what @Jf20 has recommended 🤷♀️
The only time it makes sense to pay by the hour and not under a NWNF is when your claim is worth massive amounts (and has very strong merits) and legal fees are dwarfed by what the 25% success fee would be. E.g case is worth £4 million, legal fees likely to be £50,000 which are covered by the other side in the event of a win. Would you want to pay your own lawyers the £1 million success fee? Probably not, most people would risk losing £50k in the event of a loss when faced with those figures if they have such funds available. If you don’t have such funds you go for a NWNF and hold your nose when you have to pay your lawyer £1 million.