I'd concur with @tehwolf 's suggestion, and I have the mesh system he suggests - an excellent piece of kit.
I would caution that if the bungalow has solid brick internal walls, then whilst a mesh should greatly improve things, it may still struggle in places. Types of brick vary in density and composition, some are OK-ish, others can be virtually impenetrable by wifi signals, in which case the signal propagates through the bungalow via doorways, or reflected signals bouncing off walls or even through the roof space. My house has this type of hard brick for the external walls, and it reduces speeds to very low double digit megabits where the walls create radio-shadows. If this applies, you might need to run ethernet cables from the secondary mesh units back to the primary if the performance still isn't what you want, but you can try a mesh system in wireless mode, see how it works, and then add the cable links only of needed, but it's worth giving some thought to beforehand.
Another option (depending on your mobility, safe accessibility, power supply, and whether the loft space is dry and weatherproof) would be to site a new router high up in the loft space, and have it "looking down" through the ceilings, so long as they aren't foil-backed plasterboard. Normal plasterboard is virtually transparent to wifi signals. If thinking about that, work safely, and trial it with temporary trailing power and ethernet cables before making the effort to put it in place properly.
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