Anthony Andrews imitates Edward, Duke of Windsor (but slightly better than Edward Fox did in 'Edward and Mrs Simpson'), while Jane Seymour is a fairly OK Wallis Simpson, a little bit scheming and a little bit vulnerable. She's backed up by Aunt Bessie (Olivia de Havilland, note-perfect but hardly stretched), while he is supported by Winston Churchill (Robert Hardy, good as ever).
It's the usual story often presented in true TV-movie style, very glossy and very referential to the Royals. So nothing really scandalous or new here, and sadly the film remains flatly unemotional so there is no engagement with the plight of Wallis or Edward.
So it is a reasonable effort, watchable television, but nothing fabulous. 'Edward and Mrs Simpson', having the luxury of more time to tell the story, is better; 'Wallis and Edward', getting the casting and pacing wrong, is worse.