Robin
Are you serious about a "bomber"?? This is straight out of the Daily Mail...
AFAIK spamcans are normally intercepted by police helicopters; a twin turbine can easily outrun a C172. A jet could shoot one down too; what it probably cannot easily do is escort it to some airfield as was suggested higher up here.
I know the international interception procedures are supposed to provide for slow aircraft interception by jets, but I am sure 99% of PPLs have never heard of them.