No brainer shirley?
Transport caffs back in the fifties and sixties mixed a large pot of strong tea with milk and sugar added, just how builders like it, and poured all the teas from that.
Apart from that one specific, nay unique, situation, other posters have it right. Tea must be made with boiling water. Tea + milk is not boiling.
Milk should be added to taste, once the desired strength has been achieved.
One nasty thought - it wasn't UHT milk as well was it, to really compund the offence?