[PORT] acronym for this TF

Because of previous uncertainty about the acronym for this TF I've been
using [PORT/THES] in previous mails, but I've realised this causes problems
for the mail archive search service, so I'm going to switch to just [PORT]
from now on ... I propose we all do the same.

Al.

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Alistair Miles
Research Associate
CCLRC - Rutherford Appleton Laboratory
Building R1 Room 1.60
Fermi Avenue
Chilton
Didcot
Oxfordshire OX11 0QX
United Kingdom
Email:        a.j.miles@rl.ac.uk
Tel: +44 (0)1235 445440