Dry weather will hold on across most parts of the UK this weekend. Sunny spells will continue in many areas but mist and fog patches will mean murky mornings for some. A band of cloud that will sit across north-west Scotland on Saturday will move southwards to affect other areas on Sunday, perhaps delivering a few spots of rain. Friday brought a maximum temperature of 20C (68F) at Fyvie Castle, Aberdeenshire - Scotland's warmest day of the year so far - but temperatures will drop a little over the weekend. Some bigger changes will take place next week as high pressure loosens its grip. On both Saturday and Sunday mornings, some of us will be greeted by mist and fog. The fog will be patchy so some places will be shrouded while others will remain clear - but where it does occur it could be rather dense, reducing visibility on the roads. Fog forms when the air temperature drops overnight. The colder the air gets the less water vapour it is able to contain.…