Help needed - RAID recovery from Power-fail

[Nigel J. Terry]

I had a power fail, and now I can't access my RAID array. It has been
working fine for months until I lost power...

I run FC4 (64bit).
I have an array of two disks /dev/sda1 and /dev/sdb1 as a raid5 array
/dev/md0 on top of which I run lvm and mount the whole lot as /home

When I boot, I get:

md0 is not clean
Cannot start dirty degraded array
failed to run raid set md0

then:

fsck.ext3 No such file or directory while trying to open
/dev/RaidGroup/RaidVolume

Naturally I don't have a full backup, so somehow I need to recover if at
all possible.

Please help...

Nigel