I believe Antich weave most of the cloth for the HFW group.
The problem with weaving a pattern is that you have to reset and reprogram the loom which is time consuming and has a cost that has to be recovered either by unit cost or quantity or both,
There used to be a POW patterned Fresco which they no longer sell. Probably didn't sell well. So your answer maybe there.
I would be surprised if Lovat had signed such a restrictive contract with London Lounge.
Do you know if Antich wove Rangoon or Fresco before Gladson purchased HFW? I know that Martin Sons originally wove Fresco and HFW purchased the rights to the range when it bought out Martins. The problem you may be having is that the mill(s) that produced Fresco and Rangoon no longer exist or don't do business with HFW any more.