You can get frontal information, albeit from the low chart, from
[The Met Office although you have to register free of charge. The French met office
Meteo France also provide these charts, once again register free of charge.
There are other providers such as NOAA who link to the Met Office, but I empathise with you in that frontal information should never have been removed from SIG WX charts.
Just one more example of the increasing neglect of professional opinion by the pointy head people.
