... one of these replacement turbo cartridges from eBay. They seem to be a cheaper than getting a rebuild done - this one is supposedly even hybrid.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/323421098606
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/323421098606