I could speculate that the owner had bought their VCS light sixer (also in the loft) probably in 1982 and a son or daughter had made some notes on the torn pages.
It's interesting to see the release of ET, (rushed out in time for Xmas 82) and then later catalogue pages showing it's swift reductions in price, eventually to 6.99. The VCS had also been reduced to 49.99 as well, including a free Pac Man cartridge. The bottom had evidently dropped out of the VCS market, with newer machines now available and the retailer wanted their stock gone.