This morning speedtest result was...
Just spoken to VM faults and had no luck, the person on the other end said that my modem is fine (he checked the modem from his end after he asked me for the modem's MAC address), and that I don't need an engineer to visit. I also read out my Downstream SNR and Power Levels and he said these were ok.
He also said I need to have my PC looked at by a computer technician (there's nothing wrong with my PC).