I am emigrating from the UK to Australia. WIll my UK landline
telephones work in Australia. I have a four handset DECT phone system
- Panasonic model KX-TCA151EM - which I wish to take with me.

It will probably work, but you will need to check that the telephone
is approved for use by the Australian telephone authorities.
Particularly for a cordless phone, the permitted frequencies may be
different.

Also, the way Caller Display / Calling line identification works
varies between countries. You may be able to get the Panny to work by
changing a setting in the set-up menu on the phone.

Owain

I didn't find that model number on the Panasonic Australia website,
but you could ask them:
http://panasonic.com.au/products/category.cfm?objectID=28