Eddy - I can't be sure what caused it. From a history point of view, I only learned to basal test etc in January 2007! At that point, I needed 20u of Lantus per day and putting it all in at night worked.
Weight then started coming off (which was good, as it was the Lantus overdose of yesteryear that had caused it to go on in the first place). As more and more weight came off, I gradually had to reduce the Lantus. IIRC, all was well at 16u per day. I then had to reduce it further. Once I took it down to the 14u per day (what I needed) something just flipped and the problems came on in spades. These days, almost 70% of my daily insulin comes from bolus. I'm not a complete carb monster either. Imagine how I kept in the old days when I used to be on 35u per day of Lantus and around 20u of Novorapid.... No fun at all for most folks but with my body's preferences it is no wonder I bounced off the end stops for years 
Subby - Thanks for that. I have indeed done something along these lines and the PM seems fixed. If anything I drifted a little higher today in the PM but that could have been the ice cream I had earlier finally getting in.
You've got to love that about a pump; if your problem is in one bit of the day, you can fix that little bit without having to louse up the rest.
Gary
__________________
13 years of MDI
And then a little pump floats by
And now my pants are filled with tubes
That tangle all around my.... er .... knees
The hours I'm hooked up? All twenty four
And that's it for now until evermore
But I disconnect for up to an hour
For wonderful fun (and sometimes a shower) 
And when I 'suspend' it, it plays Barry White
And my wife knows she's in for one heck of a night
But only an hour of that night is with me
As an hour is all I'm allowed now, you see...
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