Having priced up the 2 builds, it's going to cost £405 for an Intel i3 7100t setup (35w TDP), Gigabyte GA-H270N-WIFI, 8GB RAM, case, cooler and PSU.
Alternatively, for an AMD 5370, ASRock AM1H-ITX and the other bits, it'll be £270, so a fair difference.
I may just pony up for the more...