This brand product is not legally available in the US. I would not suggest using a product not approved here in the US.I prefer the Juvederm and Restylane products for lip injections .
This particular brand of filler is a Swiss manufactured filler and I personally don'y habe much experience in using this. I have not come across it in the UK but I assume it has been appropriately tested.My preferred choice of filler is either Restylane or Juvaderm.