Nodge68 said:

Are the codes current or historic?

P1259
The immobiliser issue is odd, but if the ECM and immobiliser module weren't happy, the engine wouldn't start.
I'd check for damage to the wiring harness under the air filter box.

P0336
It wouldn't run if the crank sensor was open circuit, but they can still run when the crank sensor is beginning to fail, often resulting in stalling or misfiring under load. Crank sensor failure is pretty common, often due to water ingress into the plug, or just bad connections at the plug.
The crank sensor is about £25 for a good quality replacement, and about 10 minutes to install.

P0113
The intake air temperature sensor isn't expensive, and takes 5 minutes to replace.

P0134
The O2 sensor is an odd issue, but it appears like it might simply be unplugged.
Has it had a recent EGR valve replacement? as the O2 sensor needs unplugging to do the EGR valve.

P0299
This is fairly common code.
Unfortunately it can be down to few things. It could be a simple split boost hose, which are common. It could be sticking turbo vanes, or boost control servo sticking.
It could also be a split intercooler, but this is less common.

A bit more investigation is needed here.

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