Thanks waterdrop, Keith, AquaTom and everbody who advised, supported and encouraged me! Thanks to daz30347 for the great selection of wood!
Here are some photos of the tank (taken with a mobile so not great!):
6 Hemigrammus rhodostomus - rummy-nose tetra but they appear to Hemigrammus bleheri - Firehead tetra. They have started shoaling beautifully quickly and i think i will get another 4 to have a shoal of 10.
4 Melanotaenia boesemani - Boeseman's rainbowfish (2 male and 2 female but might be 3 males as they have coloured up brilliantly since arriving and swimming great. Will get at least another two but the remaining fish in the shop were too young.
2 Mikrogeophagus altispinosus - Bolivian Ram (hopefully one male and female but not sure). Initially shy but have begun roaming now.
Added 2 more Melanotaenia boesemani - Boeseman's rainbowfish. These are definitely male and are bigger as well. They have already helped to bring the colour out in the other rainbow fish.