Just for the record - if you were on the 4pm LHR departure, and it's late day arrival into EWR - this connection time would be no problem with no checked bags, and doable with checked bags. I did this flight last Tuesday, and was land side in EWR less than 10 minutes after exiting the plane, with no checked bags. Even with a C-A terminal transfer I had more than enough time to spare for some food and then sit for 20 minutes once air-side again.