The last time I saw Peter was when I ran into him at the station on my way to Glasgow.

• A. I haven't seen Peter since a chance meeting with him at the station when I was setting off for Glasgow
• B. The last time I went to Glasgow, I happened to meet Peter at the station.
• C. When I last saw Peter at the station when I was on my way to Glasgow, I ran after him.
• D. I finally saw Peter at the station when I was on my way to Glasgow.