I've just wasted a few minutes trying to establish whether this is OK for the US, and then noticed that your heading says Spain to UK, so I suppose you want a UK term. This is definitely it.

First, a very useful document on the legal meaning of "autoprestación" for these purposes in Spain. The essential points are that it means not offered to third parties, for own use. Interestingly it has been also been established in case law that networks in public libraries also fall into this category.
http://wikitel.info/wiki/Autoprestación

It cites Directive 97/67/EC as the earliest relevant definition of "autoprestación", in the context of postal services. The English version of this Directive uses "self-provision".
http://eur-lex.europa.eu/legal-content/EN-ES/TXT/?uri=CELEX:...

Other EU documentation uses "self-provision" for this. More to the point, perhaps, so does the UK. Here's a 2001 paper on communications liberalisation in the UK:

"FULL LIBERALISATION OF PRIVATE NETWORKS
The Duopoly Review led to extending the use of “class” licences, or “general authorisations”, which cover broad categories of activity carried out by a wide range of organisations, obviating the need for an individual licence. No registration procedure or payment of fees is required. The two key ones are:
The Self-Provision Licence (SPL) allows companies and others to set up their own telecommunication systems linking any number of sites up and down the country. All traffic on the system must either originate or terminate with the person running the system and there must be no charge for any telecommunication services provided over the system."
https://www.wto.org/english/tratop_e/serv_e/symp_mar02_uk_co...

And here's another:

"Pursuant to the EC Licensing Directive (Directive 97/33) , and the forthcoming new EC Authorisations Directive, telecommunications authorisations can be expected to be increasingly provided for in the form of class licences, avoiding the need for prospective licensees to apply for an individual licence. In the UK, such licences are issued under section 7(3) of the 1984 Act and there are over 23 types of such licence, but most are for a specific service or network and at this stage only the following are of common application:
(a) a licence for the self provision of telecommunication services;"
http://www.cms-lawnow.com/ealerts/2001/11/convergence-and-te...

And here's a report on Spain itself:

"To apply for general authorisation, an application is made to the SETSI, following the procedure and requirements set by the Ministry of Industry, Energy and Tourism and on payment of a fee. For a private use, there is a so-called "individual authorisation" which is designed for use by radio amateurs with no economic content, or for self-provision. "
http://us.practicallaw.com/5-620-1472?q=&qp=&qo=&qe=

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Note added at 2 hrs (2017-01-28 09:08:15 GMT)
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Pardon me for quoting your own source back at you as if it were news. I didn't notice it was the same document.

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Note added at 8 hrs (2017-01-28 15:03:37 GMT)
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It's a pleasure. I know the feeling; I've just had a week of working late myself. When you find yourself reading a sentence three times and taking nothing in, you just have to call it a day.

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Note added at 9 hrs (2017-01-28 15:50:44 GMT)
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No problem! We are supposed to look at the title, after all, but you know how it is, sometimes you forget, and I'm used to you working into US English so I tend to take it for granted. It's just nice to have the information provided anywhere! As you well know, most people don't bother.