I hear where you're coming from but they aren't cheap cars to run and maintain. A cheap end car is unlikely to have been maintained. Has the diff oil ever been changed? What about the gearbox oil? The oil isn't cheap!! A re-con box starts at 4k...
There’s no longer such a thing as a Sonnax valve body assembly. I would suggest that you send your worn unit to someone like Valve Bodies UK http://www.valvebodyuk.co.uk/ or STA Aylesbury https://www.staautogearbox.co.uk/ who own a Hydra-Test...
I was quoted around £320 per key for the non flip 2005 key. Around £260 was the key the rest was pairing it up to the car.
Got one from local indi and paired it myself.
fbh wouldnt turn on with the remote today (battery is fine)
car also decided it didnt need glow plugs either and started up straight away!! dash said 2c
its obviusly decied its summer and i should stop being a mard.. dont i know its april!?