Hi guys, becoming a semi regular enquirer now so hopefully I'll get the usual spot on advice! I am off on another sojourn up to Aberdeen on Friday and coming back on the 27th. I will be traveling from Kings Langley going via Kings Cross. Both ways from Kings Cross to Aberdeen I've taken advantage of the EC rewards (same conditions as an advance ticket) offer. Now to ensure I am covered for any delays on route do I need to buy both portions of my Kings Langley to Euston journey in advance? (I am planning to walk from Euston to Kings Cross both ways). From previous experience I know I need to buy the Return journey from Euston to Kings Langley in advance since intent isn't enough to cover me, (I'll be traveling on the 14:50 from Aberdeen on the 27th) so I'm slightly at risk of missing the last train from Euston to Kings Langley should I have any heavy delays into Kings Cross. The part I'm intrigued by is do I need to buy the portion from Kings Langley to Euston in advance or if I turn up in good time to catch the 8:40 from Kings Langley (10:00 from Kings Cross to Aberdeen), is that sufficient to show the intent if I get delayed?