Expedite technology transfer, for example. For the GB being able to exploit and plunder the Indian subcontinent, they have to provide good transport system to transfer all the plundered goods back to their country. Just look at Indian's rail system now. It is hard to imagine them having it without this unintentional transfer of tech.

Having said that, I don't condone using this argument to make things right. Ethically their still wrong. At least The Netherlands has the guts to admit it. My country is one of the countries exploited by the British. It is nice, as a good gesture, to hear the British to admit they used to be the bad guy. It's not going to change anything in the past, but it can somehow provide a sense of closure for the future.