a) There was no theft, as correctly elucidated previously, there was no deprivation, and arguably there was no dishonesty, the mental requirement of theft (s1 Theft Act 1968)
b) There is no chance of a burglary charge..as a CPS lawyer, the very suggestion made me laugh...it would be impossible. No mens rea, no theft, and theft is required with intention s91a or 91b) either before or after an entry(3a). It CANNOT be committed by a 'theft' one week and an innocent entry the next.
c) You do not have a cause for wrongful arrest. There was no arrest.
d) Thus, you Do have an arguable false imprisonment case. This is civil and not my speciality...see a local solicitor, it is advisable!