Thanks Guys,
I tugged at all lines without success. Then I noticed that the port side car traveller was jammed hard up at the outboard end of the boom.
With several gentle taps by a 4 lb lump hammer (via a plastic drift) that traveller become free and the lines became loose. I have not raised the sail as yet.
Having read the various responses I was wondering if an improvement might be, to place a 6mm bolt through the boom section at each end, so as to limit the amount each car can travel. This would limit the size of each of the reefs but does that matter.
Would appreciate feed back.
Regards
Aquapore