I see. Well for those types of games you definitely don't require a discrete GPU so the 3200G is a good choice.
The build you proposed is more than fair. Just a couple of points you might want to consider since you've technically got another 100 quid to spare:
- 16GB of RAM since you've only got 2 DIMM slots. You can find something for another 20-25quid. In theory, 8GB should be sufficient however I personally know that during programming, I can often have dozens of apps and tabs open at the same time. If you think you do that a lot you will eventually want 16GB.
- 240GB SSD is quite restrictive IMO. I would suggest a 480 for another 20quid for more comfort. But in theory 240 is enough for what you've listed.
As for the PSU, it's a sufficient choice for your build. However, if you feel that you may someday add a discrete GPU onto your build, keep in mind that it is recommended to upgrade the PSU along with it. In which case I would recommend something like this:
https://uk.pcpartpicker.com/product...ified-semi-modular-atx-power-supply-ssr-450fm (best of the lot)
https://uk.pcpartpicker.com/product...-w-80-bronze-certified-atx-power-supply-bn246
Note: It is by no means a bad build so if you're satisfied with it. Go for the parts you've selected.