I suspect the Polyline failure is something to do with working out the 
shortest way around the world between two points. The sample that works

http://wtp2.appspot.com/osdemo2.htm

has a polyline vertices either side of the OS projection's central meridian.

The projection docs state 

"Generally, you may use a projection for two cases: to create a map of the 
world, or to create a map of a local area. In the former case, you should 
ensure that your projection is also rectilinear and normal at all 
longitudes. Some projections (especially conic projections) may be "locally 
normal" (i.e. point north) but deviate from true north, for example, the 
further the map is positioned relative to some reference longitude. You may 
use such a projection locally, but be aware that the projection is 
necessarily imprecise and transformation errors will become increasingly 
apparently the further away from the reference longitude you deviate."

UTM and UK OS are both Transverse Mercator  projections so do not wrap 
around the world East to West (and are not used to wrap North to South 
either) so might be considered 'local area' projections.

Perhaps there needs to be an attribute of the Projection that tells the the 
poly renderer that the projection is 'local' and does not wrap around the 
world. But then on the other hand I might have missed some other cause of 
this problem.

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