what year did 1.9 change from PD to common rail?

[cmp260]

I'm thinking about buying a T5 to convert to a campervan. Im thinking about an 08 plate T28 SWB, but I want to make sure I have common rail not PD (am I right in thinking its not so fussy about oil due to lower operating pressures?)

does anyone know what year VW changed the 1.9 TDI to common rail for these vans?

any general advice about campervan conversions also apprectiated. Should I pay or do it myself?

thanks