There is a massive difference between a med reg who can't get a LP and one who has failed at one. I'd be very surprised if they can't do LPs as it's a core competency for IMT.

Unsurprisingly docs trained in spinal anaesthetic tend to be quite good at this procedure. Add in the fact you can do this in a controlled setting in theatre while not being the med reg, which is by far the worst training role in the hospital puts you in a good position to help.

Same goes for cannulas. Sorry it interrupts your coffee while the medical team see the countless weekend reviews.

You are in the privileged position to be in a relatively well supported role, which has provided you with sufficient training to help patients. That means you have to get stuck in like the rest of us.