Thanks for confirming
I thought it would be fine. Mikki's post gave me an idea so I went off and searched, looks like Facelift D2 compressor is a Denso 7SE unit which appears to take Denso PAG 46 density oil. Rang ATS and asked them what grade is their PAG oil, they said 46. So it seems it should be fine. Re booked with them for next Monday.
Audi fixed servicing aircon is £79 I believe, not sure I could haggle them down to £28 which I paid for the groupon.