He is appearing in cariad@iaith (which I am reliably informed translates Love for Language) on S4C, nightly this week (8.30/9.00 Sky 134, English subtitles available).
The programme's website describes it as follows:
Eight celebrities are set to spend an intense week learning Welsh in an eco-friendly chic campsite in Pembrokeshire.Among Lembit's fellow contestants are Colin Charvis and Helen Lederer.
My reader comments (a little acidly):
One might ponder that such a course might have been more appropriate before securing Montgomery rather than after losing it.