If you're getting a lot of blue smoke from the exhaust, the engine is probably worn - rings/valve guides, for example. As your car passed the CT, this probably isn't the case.
Am I right in thinking that you've looked at the bottom of the sump to see if there's a leak from the sump plug, and it looks dry?
Have you tried running the engine, parking the car overnight, and then checking to see if there are any oil stains on the ground?
If your car has an oil filter, have you checked to see if there's a leak from its gasket?
Any leaks from the rocker cover gasket?
How much oil is the car using?
If there's no smoke from the exhaust, you could check to see if the pipe arrowed in this photo is blocked (I'm assuming your car has this pipe). It runs from the rocker cover to the carburettor.
It'd be really helpful if you could post a few more photos of the engine bay.
Good luck!