Imagination Technologies (IMG) dropped about 70% over the last day or so as Apple says that they will no use IMG's graphics processing (GPU) technology much longer. The stock dropped from a high of about $300 US to a low of $76. It dropped $180 in today's trading, stabilizing at about $90. You might have an issue when the largest company in the world says they don't intent to buy your products much longer, especially if they are your largest customer.
Read about it here.
Apple says that they will take other approached to get their graphics. IMG says that will be hard to do with their intellectual property protection.
IMG is very similar to ARM Holding who makes the technology, not the products. But last year ARM got gobbled up by SoftBank (which owns Sprint), so Great Britain is becoming even less great the day or so after BrExit (wondering if any relation there). IPZine blogged about ARM holdings not holding out here.
Yes, intellectual property will be an interesting problem for the UK as they work out the divorce agreement(s) with the EU.