You're not "screwed"; stop panicking.
If compensation isn't an option, then we look to a referral. AST5.2 (in the same PDF) says:
"Where a student fails one or more taught modules, including those studied as part of a Professional Doctorate, the Award Assessment Board may:
...
allow the student to be referred in the module(s), in whole or in part of each element of assessment, at the next available opportunity."
Given that it's only February right now, "the next available opportunity" would surely be before the end of the academic year. Even if not, later in the same section it says, "A final year undergraduate student may be given an extended referral opportunity, which will mean that they can complete referral assessment by the start of the fourth week after the start of teaching of the next academic year, without having to attend."
So you wouldn't need to repeat the whole module - just the assessment you failed. That should be able to happen before the end of the year; if not it would be at the very start of the next academic year (which would delay your graduation).