Agreed if the low develops as progged here, it would not take long for it draw in colder air from the east, north and north west.
Keeping an eye on it at t.144. The low is getting squeezed flat. It could easily undercut. Just need it to be further south.
Compared the the 06Z..
The Low is tilted at a different angle and the Channel low is gone, so not on the same trend as 06 and 18Z post t.72, but, a bigger chance of the low sliding under if we can get it moving further south as the current run has demonstrated it doing.
All I'm going to say is that the time frame post 72 hours is looking very interesting...... watch this space.