the police can take my flatmate to court for theft
Are you familiar with the legal definition of theft? If not, look it up (Google) and consider how closely what you know about what happened would match against that definition.
the police can take my flatmate to court for theft
The reason I am reluctant to make a report it because I don't want to land my flatmate with another charge of theft if the TOC aren't prosecuting for that anyway, I fear that once I report it the police can take my flatmate to court for theft and it will be out of my hands, he would much rather just pay for my train fares, if there was a way to get the ticket with no charge of theft for my flatmate I would take that but it doesn't look possible
Another?
Perhaps you need to consider carefully what might be "borrowed" next time.
It is unclear whether a crime of theft has been committed. Theft requires, inter alia, an "intent to permanently deprive" another of an item and "dishonest appropriation" (s1 (1) Theft Act 1968). If the OP and his flatmate had an understanding (implicit or explicit) that they could share property (as Nick W alludes to, then there was no dishonest appropriation. If the flatmate intended to give the ticket back that evening, there was no intent to permanently deprive.If the OP reports the ticket as stolen and gets the crime reference number, then the OP can probably begin to seek to get a replacement season ticket legitimately. The TOC can still continue to take its action against the flatmate caught with it.
This is going along the right path (a crime has been committed of travelling without the payment of fare) although the ticket belongs to the OP for the purpose of the Theft Act as he had possession or control of it (s5 Theft Act 1968).But this is not the case. The OP and his housemate have a mutual understanding that they may borrow each other's property without explicit permission. In this case, however, the property concerned was not the OP's, but the TOC's property. Therefore, the crime is not against the OP, but the TOC.
I have no doubt that the police would simply log it as "no action taken, case closed".It is unclear whether a crime of theft has been committed. Theft requires, inter alia, an "intent to permanently deprive" another of an item and "dishonest appropriation" (s1 (1) Theft Act 1968). If the OP and his flatmate had an understanding (implicit or explicit) that they could share property (as Nick W alludes to, then there was no dishonest appropriation. If the flatmate intended to give the ticket back that evening, there was no intent to permanently deprive.
I have no doubt that the police would simply log it as "no action taken, case closed".
I have no doubt that the police would simply log it as "no action taken, case closed".
Surely the police can't issue a crime reference number for something that was not a crime?