Here is the RSGB format:-

Character
1 - 6     Date in YYMMDD format
8 - 11    Time in HHMM format
13 - 16   Band in MHz (embedded periods are allowed eg 1.8
18 - 20   Mode (A1A, J3E, F3E etc)
22 - 36   Callsign (left aligned)
38 - 40   RS(T) sent
42 - 45   Serial number / Power / Zone / State sent (contest dependent)
47 - 49   RS(T) received
51 - 54   Serial number / Power / Zone / State received (contest dependent)
56 - 59   New Bonus / Multiplier (country code / county code etc)
61 - 64   Points (Note: for VHF Contests only, character 60 may be used if the points exceed 9999)
66 - 71   Station Callsign/Operator Callsign for multi-op events
73 - 78   IARU Locator
80 - 80   "M" if this Locator is a new multiplier (Locator multiplier contests)
82 - 84   Postcode as given in the "UK county codes for HF and VHF contests" table
86 - 86   "M" if this Postcode is a new multiplier (Postcode multiplier contests)
88 - 90   Country code eg G, GI, GM, GW, F, DL
92 - 92   "M" if this country is a new multiplier (Country multiplier contests)
94 - 256  Free text for QTH information and/or comments.  THIS FIELD MUST BE TERMINATED BY <CE>.  
	  Zero point QSOs such as Duplicates, unfinished contacts or poor signal reports etc may
	  be explained here.  This field should be left justified and may contain spaces but not tabs.

All other characters are spaces