I'll bite and chime in here lol. Ive picked up your main two points i think
1. Exchange rate fluctuation
2. Businesses with UK offices / operations moving elsewhere
1. By definition, an exchange rate is the value of a currency based on future value/buying power. So, the rate you see today is what the experts think will happen in the future. FYI when Germany joined the EURO in 19 blah blah they devalued their buying power by around 20% overnight. Anybody with any sense would see this would happen. Now, moving on to volatility, traders love this, it gives them ample opportunities for intra-day trading. You see YT trader etc "How to make $500 a day" they love volatility because it gives them good returns in short periods. The UK is the home for Financial Services, it is their main industry and so this situation suits the big players who of course have connections or ears to government officials.
2. People see-saw with the business issue. But lets think about the facts here, the EU is a trade-free zone, once the UK is out imports incur duty and exports include VAT. Long story short, everything costs ~ 20% more. Now obviously, business with smaller margins cannot absorb this expense increase so they will probably leave. The ones that can, will probably do what every big corp does, pass the increase on to the consumer.
In summary, GBP will continue to fluctuate or if we leave drop in value leaving average Brits poorer and struggling. There will be social outcry, perhaps even some good old fashioned anarchy. IMO based on the rules, the UK wont leave the EU ( and had no intention to do so) or if by miracle they do, you can be rest assured we will be using our Irish friends as a back channel for goods and have the best of both worlds.
