If we ignore the 6z GFS we can see that the centre on the HP has moved from NI to Scotland from the 0z to the 12z.
0Z
12Z
If this Patten continues, then in a few more runs time the HP could be even further north allowing a good undercut.
Yup think eastbourne in the sweet spot, heavy ppn whilst staing as snow, anything west of say seaford looking like a snow to rain event. but things ma change