Not very D-I-Y ... but there are some knowledgeable people here.

I recently bought a Samsung Smart TV - 46ES6800 ......... having
struggled using remote to drive for example Web interface, realise I
need to get a wireless keyboard with built in mouse.

Will any wireless keyboard work ... assume that you use a dongle which
plugs into back of TV, into one of the USB ports.

If anybody can recommend a good Wireless keyboard with mouse ... please
do so.