Hello Wendy your not far from me I used to live in Huddersfield
I probably get a 70% success rate using the laminator method. Silly question but I assume your printing on the shiny greasy side of the transfer paper. This is definitely more art than science. Double check my video you may see something useful, this shows me making a board step by step. The acetone cold transfers method claims good results but not tried it. Oh did you roughen and degrease the PCB. Did you tape down the art work I normally give it ten passes through the laminator.
https://youtu.be/rGUgt_2gXy8
Chris