Yep more than likely an injector, my non Ford warranty didn't cover the fuel system, yay, ended up paying the neck end of Â£500 to a Fraud dealer. Should be able to get it done for about Â£300 from an independant garage.
Your car has gone into limp home mode after the PCU detected some fault or other with the fuel system, thats why the glow plug light is flashing. Read the owners manual to see what the engine is doing in limp home mode.
To fix it may be as simple as a PCU reset which normally costs about Â£70, if its an injector then the insurance bill would be about Â£400.