When the exchange rate decreases (e.g. the pound depreciates against the dollar)
1. UK exports become cheaper for other countries
2. This is good for UK exporters because their products become more competitively priced abroad, and so may be cheaper than similar products offered by businesses in other countries
3. UK exporters might keep the same price in pounds, which could increase demand as the price abroad decreases
4. UK exporters might increase their price in pounds, which will increase their profitability but won't increase demand