To update: I got a Dylon machine dye in Poppy Red and used it to dye one white cotton M & S T shirt, a white cotton top and my linen/viscose dress with the bleach spot.
The T shirt and the top are so perfect.
The linen dress turned out really well putting the poppy red dye on top of the raspbetty pink original colour. It just came out a little darker. The bleach spot took the dye well, not perfectly, but sufficient that it is wearable.
Highly recommended. The dye was £4.99 and I did not use the pre dye. Thank you all for your guidance.
How can I stop people from 'helping' ?

