Cranks but wont start

[Simon Wallwork]

Hi Folks

My 1999 FL S8 has always been a great starter.

I've been away for six weeks, car's not moved.

Came back, tried to start it, no joy. Battery too flat too crank properly.

Charged batt for an hour, cranked much better but still no joy.

(Believe wife tried to use the car when I was away but it wouldn't start, which is odd in itself but I put it down to wife 'doing something wrong', suspect she flattened the batt trying though, but why wouldn't it start? flooding maybe??).

Anyway, charging continues but although it cranks, there's not a sniff of it firing.

Was running perfectly when parked.

I have no clue even where to start with this.