It's up to the client to do the following:
1. Complain to the solicitors
2. Wait 14 days for the firm to offer a response.
3. Go to the SRA / Legal obmunsun for a resolution
If the client did no such thing then went straight to Trust pilot to cause libel because he's had an emotional response, then it's really on him.
Whilst I sound like I've been taking the client's side in my posts, I do absolutely agree with this. A very disproportionate response from both parties. If he'd gone down this route and still had no success/response from the solicitors, I think he would have been pretty justified in calling them scammers (and had evidence to prove he had a good reason to believe this in court).
Equally, the solicitors could have responded to the review in a reasonable manner and ask him to remove it (or I think they can respond to reviews, so just reply with the facts and leave other potential customers to make up their mind).
Stupidity on both sides
Client potentially ruined after being slapped with a ridiculous bill for damages.
Company potentially ruined, because if a single negative review costs them 30%+ of their business, then I can't see how they could possibly survive after this kind of negative PR.
They were able to demonstrate in court that the review had cost them 25k in lost business. Why shouldn't he have to pay for some of the damage he's caused the business?
Actually they weren't. They demonstrated in court that the review had cost them £12,600 in lost business (based on the fact they saw a 30%+ drop in enquiries [which I'm sceptical of, as that seems excessive for a single review]).
The £25k was awarded based on the judging looking at other "similar cases", such as a case of someone setting up multiple websites, youtube videos, twitter accounts, writing directly to potential customers etc. with the sole purpose of spreading fake information, or a case of a well known newspaper columnist with half a million followers posting libelious tweets.