Ok this was back in February, been meaning to do this for a while to be honest.
Mid/Central Portugal, possibly Tomar/Ferreira du Zezere/Satarem/Lake District area, red mk2 NA with UK plates, bloke and girlfriend/wife inside, was hootling along at a decent (but not stupid) pace, I tried to keep up in my Seat Ibiza rent-a-car, but he lost me easily...
Was it you?