bigpub - not sure that there is much difference between RIDDOR 2013 and its predecessor on this.

First you have to look at the immediate after effects and decide whether it ticks the boxes for an "injury" to worker or other to trigger a report (or record).

Then you have to consider whether it is work-related - a source on frequent debates on these forums.

Then you also have to decide whether it might be a "dangerous occurrence" and plenty to argue about in the definition below.....

Biological agents

10.  Any accident or incident which results or could have resulted in the release or escape of a biological agent likely to cause severe human infection or illness.

https://www.hse.gov.uk/healthservices/needlesticks/actions.htm

Sharps injuries must be reported to HSE under the Reporting of Injuries, Diseases and Dangerous Occurrences Regulations 1995 (RIDDOR) if:

• an employee is injured by a sharp known to be contaminated with a blood-borne virus (BBV), eg hepatitis B or C or HIV. This is reportable as a dangerous occurrence;
• the employee receives a sharps injury and a BBV acquired by this route seroconverts. This is reportable as a disease;
• if the injury itself is so severe that it must be reported.

If the sharp is not contaminated with a BBV, or the source of the sharps injury cannot be traced, it is not reportable to HSE, unless the injury itself causes an over-seven-day injury. If the employee develops a disease attributable to the injury, then it must be reported.

There is no specific mention of needlstick in either the 1995 or 2013 RIDDOR Regs.

No i dont belive you  have to send the needle off. This is intended to capture dangerouse occurances in labs and a hospital situation where a medical history would be avialable.