Thanks for the feedback @Dammit@Dogs, decided not to purchase anything and turns out I didn't need to.
Got home yesterday afternoon, both cats were again hiding under the sofa. After a couple hours working quietly in the same room, Mum came out and after a couple more hours was relaxed enough to settle and snooze in the open. For the first time she was happy for me to approach and as soon as I started petting, she relaxed further, started purring and her son came out to join in!
Was quite late, so excuse the only non-blurry photo which showcases the current state of the Cat Introduction Zone
Thanks for the feedback @Dammit @Dogs, decided not to purchase anything and turns out I didn't need to.
Got home yesterday afternoon, both cats were again hiding under the sofa. After a couple hours working quietly in the same room, Mum came out and after a couple more hours was relaxed enough to settle and snooze in the open. For the first time she was happy for me to approach and as soon as I started petting, she relaxed further, started purring and her son came out to join in!
Was quite late, so excuse the only non-blurry photo which showcases the current state of the Cat Introduction Zone