OT: Convert UTM to Longitude/Latitude?

I'm using an interesting Spanish map source at
http://sigpac.mapa.es/fega/visor/

Having zoomed to an area around Competa and Canillas (a few miles NW
of Malaga in Andalucia, southern Spain), I want to read the long/lat
(DDD.dddd) of a few locations, for calibrating some GPS tracks I
recorded on a short walking holiday there last week. But the site
shows UTM co-ordinates, with which I'm unfamiliar. For example I see
these:

COORDENADAS UTM
---------------
X : 408446.95
Y : 4080382.00
Huso : 30

So how do I convert UTM to Long/Lat please? After some googling, I
downloaded a simple conversion program called utm2dll. However, it
asks for a Zone number and letter. Is the zone the number
I see against 'Huso' please? And what is the zone letter? I see
nothing about that anywhere on the map...

Presumably the conversion is not quite as easy as say Fahrenheit to
Centigrade, but I'm hoping it's closer to that than Laplace
Transforms. <g>

--
Terry, West Sussex, UK

.

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