::I'd really like to do something more 'electronic' - I.E. smaller and
::lighter

Have a look at the LEM range of encapsulated 1 turn tx with hall effect=20
sensor. They're not cheap though, I have an ancient LM25 (I think it is).

<http://www.lem.com/hq/en/component/option,com_catalog/task,displayserie/se
rie,LA%2025-200%20-P/output_type,/>

Digikey are supposed to stock them , but i can't find them, but here is an=
=20
RS page

<http://australia.rs-online.com/web/c/?searchTerm=3DLEM&sra=3Doss>

Colin
--
cdb, colin@btech-online.co.uk on 12/09/2011
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