I cannot speak to the UK. In the US the answer is yes, and the principles should be pretty much the same. I'll give you the parts I would use; in the US I would be able to find them at any home improvement store. 

You will want to buy a small single-gang metal junction box that is exterior-rated. You will need a green screw for the inside of this box; the box itself will need to be grounded and above grade. (It can't be buried, in other words. Most people stick them on poles if it HAS to be in the middle of the yard, or just attach them to the house.) 

The second thing you will want is a fitting that screws into the sockets on the exterior-rated junction box. This fitting will have three parts. The first is the part that screws into it from the inside. The second is a rubber part with a hole in the shape of Romex, which is the standard jacketed cable that we use in the US. The third part is a nut that screws over that and compresses the rubber part between the two metal parts in order to form a watertight seal. 

After that, you'd do the normal thing -- wire nut the hot and neutral connectors together, and wire the grounds together while also wrapping one leg of the ground around the green grounding screw. 

How do I join two cables outside so that they're safe and kept dry?
What are the standards/recommendations for Drush make files that are included in contrib modules? Specifically, should these make files be included by default (module_name.make) or not (module_name.make.example)?

If they should be included, what is the recommended/supported method of overriding/ignoring them? Is there any documentation to point module maintainers to when discussing this in their issue queues?

EDIT: Found this post by jhedstrom from June 2012 recommending naming make files with '.example' suffix. Is this still the recommendation, or have things changed since then?
https://drupal.org/comment/6160018#comment-6160018
