On 20 Jun 2014, Onetap grunted:

On Monday, December 1, 2003 10:38:15 AM UTC, Roger Mills wrote:
"Fiona Reid" wrote in message
news
Can anyone suggest a method for connecting a garden hose to
a shower hose?

Not really a problem. A standard shower hose uses 1/2" BSP threads. A
standard outside tap - to which you would normally attach a garden
hose - has 3/4" BSP threads on its output - but some have 5/8" BSP or
even 1/2" BSP threads.

Incidentally, the mind boggles as to why you want to extend your
shower into the garden!

As the owner of a Labrador Retriever I'll take a wild guess...!

What he said, 1/2" BSP, no problems.

However, note the hose isn't designed to take hot water, it will
soften and will split

A quick look on ebay throws up a proper 4m shower hose:
http://www.ebay.co.uk/itm/251227250860

....and you could use two back-to-back with an adapter:
http://www.ebay.co.uk/itm/261491595941

--
David