Encouraged not to piggy back on another thread, wanted to ask a question about time through customs. Arriving to LHR from JFK Thursday this week the 26th @ 7:05AM to Terminal 4. Taking the tube to Euston station (1 hour), then hoping to catch a 10:20 or 10:40 train to Manchester. Is that enough time? Purchasing the tickets in advance is cheaper, unless I am mistaken, so just want to make sure I have ample time.