modified CIU look through method
40the method for calculating PRR for a CIU set out in BIPRU 7.7.4 R, BIPRU 7.7.7 R to BIPRU 7.7.8 R and BIPRU 7.7.11 R to BIPRU 7.7.12 R
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40the method for calculating PRR for a CIU set out in BIPRU 7.7.4 R, BIPRU 7.7.7 R to BIPRU 7.7.8 R and BIPRU 7.7.11 R to BIPRU 7.7.12 R