Hi all,
Can i use HS1 instead of the tube for a cross London train connection? For example to travel from Billericay to Manchester I would normally go to LST and use the tube to Euston sq. This is the suggested connection shown by national rail

However it also appears valid to use HS1 from Stratford.

Both routes let me get same train out of Euston. I would walk from St Pancras to Euston. It looks like its still quicker to go via LST and tube but it would make a more interesting alternative.
Can i use HS1 instead of the tube for a cross London train connection? For example to travel from Billericay to Manchester I would normally go to LST and use the tube to Euston sq. This is the suggested connection shown by national rail

However it also appears valid to use HS1 from Stratford.

Both routes let me get same train out of Euston. I would walk from St Pancras to Euston. It looks like its still quicker to go via LST and tube but it would make a more interesting alternative.
