Fedora :: How To Find A Collating Sequence

Fedora Core 12 I must be going mad, but I thought I used to use a command such as:

grep -r ^[a-z] *|grep .....

to do a recursive search to find all files that had lines starting with lower case a to z.

If I try that under FC12 (this is a newish install), it also finds uppercase A to Z.

Is there a collating type sequence or locale that I have incorrectly set?

PS just for info, the following shows the problem:
(Linux)retsol610 :stevet : /home/stevet> echo ABC |grep ^[a-z]
ABC
(Linux)retsol610 :stevet : /home/stevet> echo abc |grep ^[A-Z]

[code]....

ie the whole range matching seems a bit 'screwy'. A-z should give x01-x58 so A-z should be be valid and include a couple of spcial chars - but gives a range error. On the other hand, a-Z should pose a problem as that's a backward range - but that seems to search ok.

Does any one else get this in FC12 (I've just tried in RH EL5 and grep ^[a-z] ... works fine)? My locale is:

LANG=en_GB.iso885915
LC_CTYPE="en_GB.iso885915"
LC_NUMERIC="en_GB.iso885915"
LC_TIME="en_GB.iso885915"

[code]....