Networking is actually done by most people every day in social media without realising. It’s simply putting your name out there enough for you to get noticed, going the extra mile, making useful contacts in societies and from lecturers, and making local contact on your field from employment events. It’s about going that extra mile for long term gain. The reality is, a degree simply isn’t enough to get employed decently anymore. In terms of opinions on UCL and bath specifically. UCL is very highly regarded. Being in the centre of London will certainly give you the upper hand with networking and graduate opportunities, however if you play your cards right at bath you could get lucky as well. I hope this helps.