Elements required for a claim in Negligence ...
Duty, Breach, Damage
You owe a Duty to anyone who might suffer a loss as a result of your Negligence, or that of your employees.
If you are a road user,mother people who might suffer a loss are (obviously) other road users.
So John Lewis owe a duty, through their employee, to other road users, including rdv.
DUTY ESTABLISHED
Were they in breach of the Duty?
As there was no one else involved, it is reasonable to think that the JL driver was at fault.
If the driver drove in a negligent manner and crashed, then he was going to affect other road users, and so he was in Breach of his Duty.
BREACH ESTABLISHED
So who has suffered Damage?
Damage in this context means a foreseeable loss. If you block the road by turning over your lorry, what sort of loss is foreseeable? It is foreseeable that other road users will be delayed. It is foreseeable that if any road users have to be somewhere at a particular time, and that they lose money if they don't get there, then they will suffer a financial loss. So that financial loss, such as the cost of the air ticket, is a foreseeable loss.
DAMAGE ESTABLISHED
So rdv can clearly establish the required elements for a Negligence claim against the driver's employers, John Lewis.
I THINK JOHN LEWIS ARE LIABLE
Actually, I don't, but for more complicated reasons.
But I just wanted to show that it's not beyond the realms of possibility to think that they COULD be liable, so rdv's question is quite sensible, and it's perhaps a little unfair to give rdv a hard time.