As far as im aware compensation from something like this would go into some kind of trust fund (solicitors will sort it out) and shouldnt affect benefits. This is how it works for victims of historical child abuse and victims of more recent sexual offences. So cant see why the same principles shouldnt apply, but im not 100% certain.iirc £6,000 in savings and benefits starts to taper off at that point (assuming you are on income based rather than contributions based) - that was for JSA a few years ago, probably different for Universal Credit.
In any case, if they receive the cash and spend it it won't deny them benefits. I suppose it might be counted as income and have their benefits reduced/stopped for a month but I don't think it'd make them ineligible - definitely something for anyone who is claiming to watch out for though.