Simplest answer is to buy a new 'caddy' and swap the hard drive into it. Hopefully the drive hasn't suffered any damage.

You'll need to know whether the hard drive is PATA (old style IDE) or SATA (new style with completely different plugs).

The easy way to tell is PATA has two rows of pins whereas SATA has two small sockets.

There are plenty of external units available without drives, but you need to get a really simple one (USB usually) rather than a NAS (Network Attached Storage) unit which will probably need to reformat your drive before it will work.

You may even be able to install (temporarily or permanently) the hard drive in your desktop compuetr, if there's room.

Where in the UK are you? I'm in the Manchester area.