Bleeding the brakes on a Ford Escort GTi

I have bled as the haynes states :

Passenger Front
Driver Rear
Driver Front
Passenger Rear

Problem is, no fluid will go through the driver front caliper.I took the brake pipe off the caliper to find that no fluid was coming through there either !

To make sure I hadnt knackered the master cylinder etc , I checked that the passenger rear would still bleed even though the driver front wouldnt. It bled fine !

So is something blocking the Drivers front brakeline ?

How can I sort this ?