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Update 2a:

I tried the following:

sudo gdisk /dev/sdc
GPT fdisk (gdisk) version 1.0.6

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): x

Expert command (? for help): z
About to wipe out GPT on /dev/sdc. Proceed? (Y/N): y
GPT data structures destroyed! You may now partition the disk using fdisk or
other utilities.
Blank out MBR? (Y/N): y

Added to array again, lets see what happens in another 2 hours after the rebuild and another reboot.. :(

Update 2: After a seemingly successful rebuild I rebooted and got the same issue, to fix it again I tried:

lex@SAN1:/etc/apt$ sudo mdadm --assemble /dev/md0
alex@SAN1:/etc/apt$ sudo mdadm -D /dev/md0
/dev/md0:
           Version : 1.2
        Raid Level : raid0
     Total Devices : 2
       Persistence : Superblock is persistent

             State : inactive
   Working Devices : 2

              Name : SAN1:0  (local to host SAN1)
              UUID : e25ff5c6:90186486:4f001b87:27056b4a
            Events : 6058

    Number   Major   Minor   RaidDevice

       -       8        0        -        /dev/sda
       -       8       16        -        /dev/sdb
alex@SAN1:/etc/apt$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : inactive sdb[2](S) sda[0](S)
      1953263024 blocks super 1.2
       
unused devices: <none>
alex@SAN1:/etc/apt$ sudo mdadm --stop /dev/md0
mdadm: stopped /dev/md0
alex@SAN1:/etc/apt$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
unused devices: <none>
alex@SAN1:/etc/apt$ sudo mdadm -D /dev/md0
mdadm: cannot open /dev/md0: No such file or directory
alex@SAN1:/etc/apt$ sudo mdadm --assemble /dev/md0
mdadm: /dev/md0 has been started with 2 drives (out of 3).
alex@SAN1:/etc/apt$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : active (auto-read-only) raid5 sda[0] sdb[2]
      1953260544 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
      bitmap: 0/8 pages [0KB], 65536KB chunk

unused devices: <none>

Any idea what's wrong with disk 3?

Thanks

Update 1: Ok, I ran mdadm -D /dev/md1 and it's come back as degraded. Thats not so bad.. I just need to add the 3rd disk back in..

Thanks