I don't know what has happened but I can't seem to select 1st gear anymore.
There was no crunching of the gears or anything but it just happened when I came up to some lights. It was working fine previously but now its as if there is something blocking it.
All the other gears are fine, any suggestions????

 

sounds like the syncro gone, could even be the gear link, try changing gear at lower revs does? also check oil level of gear box?

 

Sounds like your selector fork is bent or partly broken