ZF are the gearbox manufacturer - they have service centres, based around gearbox rebuild specialists, dotted around the country. Think there's one round Herts side of the M25 but don't know the details - will be on their web site though
The gearbox needs to be pretty cool before it is refilled/level checked. Think 10 minute drive to get there = 3 hours standing around waiting for it to cool down enough!
Car also needs to be perfectly level when refilled and the engine needs to be run and the gear selector moved through all positions manually with a 2 second plus pause between moves to make sure oil gets to all the right places (wheels don't need to be turning)
Gearbox oil temperature must be measured with a laptop plugged in to know it's OK.
Once all the movement through the gears is done the final topup can be done.
If they didn't get at least 8 litres of oil in there then it's probably low.
If they did and it's now slipping it should log fault codes.
It may be terminal at that mileage.....
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