Former jockey Liam Hall previews Tuesday's action and gives his best two bets of the day. 15:00 MUSSELBURGH Proud Nation is a well bred son of Sioux Nation for a shred operation but the teams two year olds have been needing their debuts so far this season so may be best watched. Yy Nation showed very little on debut but is one likely to improve on that debut effort. Urgent Call ticks alot of boxes on his debut and 7f looks an ideal starting trip as his mother was placed twic