Clive D.W. Feather wrote:
Heathrow Central to Kings Cross is 55 mins on the Tube, with no changes and
12 tph. Allow 2 mins waiting time, so 57 mins overall.

On Crossrail, it will be 31 mins to Farringdon, 6tph. Allowing 5 mins
waiting time, that's 36 mins. Then allow 10 mins to change to Thameslink,
and say 3 mins journey time to Kings Cross, so it's about 49 mins total. Is
it worth the hassle of changing trains with luggage, and up to triple the
fare, to save just eight minutes?

Depends on why you're going to Kings Cross. For a LNER train to Leeds,
yes there's a big difference. But for places like Welwyn, Huntingdon, or
Cambridge, you might as well change at Farringdon for a direct train.

Why on earth would you get thameslink to KX? Get the H&S/Circle line, there's
a train every 2 or 3 minutes.

The change at Farringdon is likely to be much easier to Thameslink. Using
LU will make the change longer,

Why?

The two lines are in parallel platforms at this point; the southbound
Thameslink and westbound Circle effectively share a platform (albeit at
different heights).


Yes, but only at the northern end. The Crossrail connection to TL will be
at the southern end. To get to the west-bound Circle line platform will
require joining the southbound TL platform, walking half its length, then
taking the short staircase to the west-bound Circle line. At best, it's a
longer walk, but it's even worse if carrying luggage.