I quote here from Tony Hadland's book 'Raleigh in the Last Quarter of the 20th Century'

The idea of a folding bicycle appealed to Yvonne Rix but the volume market was shrinking and tended to be dominated by cheap 20" wheel imported machines. These sold at about £70 and had little profit margin. As noted above, Raleigh produced a similar machine, but this was dropped about 1989. In that year Raleigh started selling the 26" wheel US-designed Montague Bi-frame, which was built in Taiwan. It was sold as a Rudge, because the philosophy was, ‘If it’s not made in Nottingham, it’s not a Raleigh’.

Yvonne Rix liked the Bi-frame which, as big-wheeled folders go is a good machine. However, at about £350 when launched (= about £500 today) it was relatively expensive. Furthermore, dealers found it difficult to promote the important fact that it folded. Rather too late, Montague evolved a display stand to emphasise this feature. Despite strong efforts to promote the Bi-frame, sales were poor and it was dropped early in the 1990s.