Hee Hee Abi - most of mine are below yours!
I range between 0.36 to 0.48, with various slight ups and downs throughout the day and night. Biggest leap is at 9am, from 0.36 to 0.48 for exactly one hour, then 0.42 over lunch, down a bit, up a bit, (left a bit, Fire! LOL) TDD is 9.58. Used to be 18-20 on Levemir. (14/15u am, 4/5u pm)
I started off 15 months ago on 0.46u/hr - that's only a TDD of 11.04. There were 4 ladies all getting our pumps together - and it wasn't much different for any of us because our TDD of B & B, were all around 32u.
Have only had one occlusion so far - a fold in the tubing when it got wrapped round a belt buckle not done up properly - ie a 'real crease' - so that went in the bin and start again.
I wouldn't worry about it meself.