The case related to a new build plot with a tight deadline enforced by the developer. The buyer and lawfirm agreed a low fixed fee conveyancing rate.
The conveyancers were pushed to meet the developer's timescale to exchange. The deadline allowed little opportunity for due diligence.
The buyer sued the law firm after completion over a wider road issue that was NOT revealed in the searches.
The moral of the story is:
You may want to pay a fixed fee but bear in mind you don’t get an unlimited service.
You get what you pay for.