There are few things of more relevance to the likelihood of enjoying your fishing trip (other than a good run of fish) than an accurate and favourable weather forecast. Of course, a maritime climate as is enjoyed in most of the UK is notoriously difficult to pin down with any accuracy. Sure, even mediocre meteorological forecasters can get a general idea of when major storms are coming, but if you're trying to figure out if it's going to be rainy or sunny, the odds of getting it right immediately become poor. What is the British angler to do?
First and foremost, you want to balance being prepared with travelling light. While it may get cool enough to warrant a parka, carrying one with you in mild autumn weather is probably not the best idea. Far more useful is to take your cues from the weather forecast and give yourself a range of possibilities based upon it. Layers are always a great idea, with a thin but waterproof outer layer being the most important in most types of weather that one finds when angling.
If the weather forecast calls for a sunny day or not, if it's warm enough for bare skin to be exposed, you'll want to make sure and bring sun block with you. Of course, you'll know what strength your skin requires better than anyone else, but it is very useful to note that damaging UV rays penetrate clouds, too. If there is enough cloud in the sky to diffuse the sunlight, you may not even notice that you're getting sunburnt on a dim day, as these rays don't feel hot on your skin until much later.
For those who really want to pin-point an accurate weather forecast of how the day will be on the water, it's often a good idea to look up your own maps on the Internet and balance several different forecasts with your own reckoning. In fact, most who really need to rely upon the weather will consult no less than 4 different forecasts on television, radio and newspapers before they make a decision.
Of course, if you're prepared for the worst (or at least North Sea conditions), you'll be ready for just about any contingency. While weather trend data over the course of many years, can give you a general idea of what the climate "should" be like, with the increased chaos of climate change, you can expect far greater variation that you may have grown accustomed to.