My wife and I are flying to London in March, arriving at Heathrow at 13:00. After taking the tube to Euston, we want to take the train to Penrith from Euston station but are a bit confused about reserving a train from Euston to Penrith. If we buy an advance single for the Avanti West Coast, we could possibly run into a major problem if our plane arrives late. If we can't make it to Euston in time to catch our reserved train, is there any way to take a later train instead without buying an entirely new ticket? Is it possible to pay a small fee to alter our ticket to a later train?
We understand that we could purchase advance single anytime tickets but they cost nearly four times as much. Are there other options we should consider?
We are also confused about the offpeak singles -- what times are considered offpeak?
Thanks so much in advance!
Michael