Gail
I can't get to £385.20 exactly but I don't know all of your circumstances, but basically, the maths is as follows, I'm using weekly amounts;
Couples Allowance - £114.85 (up from single - £73.10)
Support component - £37.65
Couples Enhanced Disability Premium - £23.55 (for being in the SG)
Couples Severe Disability Premium - £128.60 (for PIP DL award)
Total - £304.65
From this is deducted your
Single Allowance - £73.10
SG Component - £37.65
Total - £110.75
Leaving - £193.90
Fortnightly - £387.80
I'm not sure where the £1.30 per week is.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
