Hi, classic structure for any negligence problem question is 1) was there a duty of care? 2) was this breached 3) did the breach cause the harm 4) is this actionable harm
DoC: So, it's safe to say a duty of care was owed - it is well established that GP's and other classes of medical professionals owe their patients duties of care (Darnely v Croydon may be cited here if you need precedent).
Breach: To establish breach you need to demonstrate they fell bellow the standard of a reasonably competent person acting in the same position - the facts here flag up two issues you should consider: firstly, what is a reasonable standard, secondly, does his competency and experience offer any mitigation? Bolam finds that there will be no breach if the defendants practice is accepted by a body of experts in that field (n/b this does not mean they can obstinately follow an old technique if it is contrary to a substantial body of informed opinion) - we aren't told if his practice followed practice guidelines, so this may be a problem. FB v Princess Alexandra Hospital (a case of a junior doctor acting in A&E, which he was not fully competent for) holds that the level of responsibility is that at the level you are acting, the defendants background will not elevate of diminish this. So - he is to be held to the standard of a GP.
We aren't actually told if he acted below this standard - perhaps a different GP would have made the same incorrect diagnosis. You could argue either way here, but the fact the ambulance crew diagnosed her 'immediately' suggests he may be in breach.
Harm and Causation: Assuming that Dr Clifford did fall below the standard of a reasonably competent general practitioner and was thus in breach, you need to see if the harm the claimant suffered was a result of this breach. 'But for' Dr Clifford's actions, would she have suffered the harm in the same way? You are told that had she had antibiotics earlier she would likely not have suffered the same harm
You may want to question whether her wait of 8 days breaks the chain of causation - but you would struggle to prove this in my opinion, as she was highly likely to not suffer this harm if treated correctly.
Thus as the earlier user commented, the real contentious part is finding the breach, the rest seems a lot of extra information without much use.