Camilla has a civil claim to make against Derick, which is time-barred by 5 years. For some or all of this time, however, she is prevented from making the claim by Mike.
It's tough to set the parameters of this, in terms of how proximate the cause would have to be, and how comprehensively she would need to be thwarted, but we could imagine a whole range and spectrum of scenarios in order to identify the correct test or principles that may be applied.
Perhaps Mike accidentally causes a head-on collision with her that lands her in the hospital for 2 days, during which time she is unable to speak or to efficiently write or type. Even in this scenario, it may depend on whether these 2 days were at the beginning of these 5 years or the very end.
Much may also depend on whether Camilla could positively demonstrate that she had any actual intentions and definite plans to actually bring the claim during the course of the valid period for doing so.
Then we may also consider a scenario where she is outright kidnapped for the entirety or the great majority of the 5 years period.
Or, where, in the final hours of the valid period, after she has spent an entire 3 weeks worth of effort preparing all of the papers for her claim, Mike burns her house down through malicious arson, destroying all of her work along with its backup, or where on her way to go get the documents printed, he drives into her car and her laptop gets smashed to smithereens and her car is no longer functioning, while her house where the sole backup is stored would take hours to return to, to fetch, by which time the valid period for making her claim would have elapsed.
Perhaps directly attributable oblique intent is required, where Mike falsely imprisons Camilla as a disgruntled customer at her place of work, standing in the doorway and refusing to allow her to leave until she sees to his car being re-serviced properly, and she clearly tells him numerous times that she would not be able to look into it until after the weekend, but that if he does not step aside and allow her to leave, that she would miss out of £X,000 (the potential value of her claim against Derick), and that in such a scenario, he would be held liable, but he continues to insist on falsely imprisoning her to meet his unrealistic and unlawful demands.
The question is, of course, when, if ever, the liability against Derick could ever be placed onto Mike for prejudicing Camilla, or if it is simply her loss.