Thanks for the advice.
I've obtained a lead and located that the ABS issue is with the front right wheel. Just need to find the time to whip off the wheel and check out the sensor/reluctor ring.
As for central locking, I've checked in the door gaiters and there are no obvious breaks. VCDS shows the following errors:
01145 - Central Locking Motors; Unlock Rear Doors 29-10 - Short to Ground - Intermittent
01179 - Shareware Version. To Decode all DTCs 35-10 - Please Register/Activate - Intermittent
01146 - Shareware Version. To Decode all DTCs 29-10 - Please Register/Activate - Intermittent
As I can't afford to register VCDS-Lite atm I looked up the other codes on Ross-Tech. The second code is key programming (My spare refuses to program so that figures) but the third code (01146) isn't listed, so if anyone knows what it is it would be really helpful.
Any ideas on what to do next appreciated. Im considering taking off the door cards and checking the resistance of the wires to see if any are broken/degraded inside the insulation. Any other suggestions are most welcome.