The offence of burglary is now defined by section 9 of the Theft Act 1968 which now reads:
(1) A person is guilty of burglary if—
(a) he or she enters any building or part of a building as a trespasser and with intent to commit any such offence as is mentioned in subsection (2) below; or
(b) having entered any building or part of a building as a trespasser he steals or attempts to steal anything in the building or that part of it or inflicts or attempts to inflict on any person therein any grievous bodily harm.
That means trespass alone is not a crime.
However, here is some light reading , for those who are not legally qualified, car mechanics, property surveyors , etc., but who would like to better informed:-
https://en.wikipedia.org/wiki/Burglary_in_English_law
PS I suggest if you want professional advce regarding a car you ask a mechanic not a lawyer or a detective
Apologises to the forum for this but it has to be said, johnzx you have twisted this around to suit yourself, no one has mentioned 'Burglary' it has been 'Trespass' totally different, for your outdated information from 50 years ago 'Trespass' into a home with no owners permission is called 'Illegal Trespass' and it is considered a crime, going to court over this is quite another story these days thanks to our dopey law enforcement, and outdated judges we now have, who in turn can't see anything wrong in a person raping a young girl because 'She deserved it' by wearing a short skirt.
Your PS is really baffling because only a short while ago you yourself told me on this forum that you did indeed know more about the repair of cars then myself, (Which I will point out I don't ) or the people I employ, who do, because you don't trust garages to do any type of honest repair work so you repaired cars for friends and so on, and now you say also don't trust a detective.
Wiki if you didn't know is very dubious in what its content is, due to the fact that anyone can write anything and include it within the website name.
Yes I know it's got nothing to do with Spain.