The permutations of what a 'guilty' JB could have done are numerous.
He could have phoned Len Foakes claiming he received the call from NB and ask him to take a look.
He could have driven to WHF in his car and finding lights on, dogs barking and no NB knock up the Foakes on the basis something was amiss and ask to use their phone to call EP (having left his wallet at home so unable to use the call box down the lane )
Alternatively he could have turned up at WHF in the morning as usual knowing the Foakes would be around and the farmhouse would be locked/bolted from within. He then looks through kitchen window and sees NB/a body.
Re those dogs which everyone believes would have barked. Some people I know live behind electronic gates. Last week, whilst the were asleep, a vast bronze horse was stolen from their front garden. There were 5 outside dogs and 3 house dogs. None of them barked..................but the robbery was caught on CCTV.
Anyway, back to what Jeremy COULD have done. Given what he said were his father's "panicked" words, off loading to anyone, other than police, probably wouldn't have been appropriate. Doing what he did, when he did it, not only gave him an alibi, it also put him in the 'higher chair'.