On the diesel ity's possible to fit a 135AH 1000CCA, sorts all kind of problems. If the battery space is the same size on the petrol you could use the same. Try Battery Megastore, Alphaline, 4 year warranty good price about £98 including delivery for the big one.
 
I would also try unplugging the RF unit and make sure you have decent battery. Also don't sell your lr322! Keep it 50k on the clock and a diesel you'd be crazy!
 

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