Speaker of the House John Bercow throws spanner into PM’s #Brexit plans #BBCNolan

More Brexit drama as the Speaker of the House of Commons has blocked the Government from bringing the same deal back before Parliament for a third time

John Bercow cited parliamentary precedent to justify his decision

Some supporters of the Government's deal have accused Bercow of Brexit bias.  

But how significant is the Speaker's ruling, and what does it mean for the likelihood of a deal with just 10 days to go until the legal deadline for Brexit?