Engine Damage Discovery 5

Hello , I am for the first time in this forum. I have been driving Land Rover for years, partly privately as well as commercially (overpassing of vintage cars and sports cars) in the closed trailer . According to Range Rover Supercharged, Discovery 3, Discovery 4 and for 3 years Disco 5. At the 4 I already had 2 engine damages with almost identical mileage after each 225,000km . The same now and in January at the Disco 5 ( the same engine 3.0 TD V6, engine identification 306dt. , PSA aggregate ) At the 4 I have with a used, little running AT aggregate. At the moment I stand before the decision to install an AT aggregate again or to have the engine overhauled. Since I was often in England in last time and there the LR vehicle level is above average high, I researched a little and the range of engines, as well as companies specialized in repairing the problem engine far higher than in our fields. My question: Has someone experienced with an English workshop for engine repair or with the company Monkey Motoren in Venlo – the only workshop I found in – well almost Germany. Thank you in advance for your answers. Christian