Q: Resized Boot Camp partition, now can't boot into Windows

I have a MacBook Pro (with Retina) with a 128GB SSD that was, until recently, evenly split 50/50 between Mac and Windows 8.

However, I needed more space on the Windows size so I reduced the size of the Mac partition to 40GB and then, because for some reason I couldn't extend the Boot Camp one, I had to create another partition that I could use to drop my stuff into on the Windows side.

I did all this via Windows.

I've now, weeks later, booted into Mac for the first time since and now I can't get back to Windows. The partition doesn't show on the desktop, nor in the Startup Disk utility.

Output from gdisk:

GPT fdisk (gdisk) version 1.0.1

Warning: Devices opened with shared lock will not have their

partition table automatically reloaded!

Partition table scan:

  MBR: protective

  BSD: not present

  APM: not present

  GPT: present

Found valid GPT with protective MBR; using GPT.

Disk /dev/disk0: 236978176 sectors, 113.0 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 453C975D-0233-49EB-A8C3-7B7BF7805CFD

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 236978142

Partitions will be aligned on 8-sector boundaries

Total free space is 4165 sectors (2.0 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name

   1              40          409639   200.0 MiB   EF00  EFI System Partition

   2          409640        79247487   37.6 GiB    AF05  Customer

   3        79247488        80517023   619.9 MiB   AB00  Recovery HD

   4        80517120       119578623   18.6 GiB    0700  Basic data partition

   5       119580672       236976127   56.0 GiB    AF00  BOOTCAMP

Can anyone help please? The partition is obviously still there, but I can't work out how to make it appear in Startup Disk again!