WANTED: your thoughts on my Pack load out!

To achieve a good daily milage on the trail I've paired down the contents of my rucksack, whilst at the same time I've tried to keep a reasonable balance of maintaining a degree of comfort. Most multi-day hikes in the UK last for 5 - 7 days whilst trying to cover about a hundred miles. Using this as a bases I've packed the items I would take on an average hike of this nature. All the items within my rucksack weigh just above 4.5 kilos with the rucksack in addtion weighing 0.7 kilos. This is my base weight before fuel, food and water. Certain items maybe considered to be 'luxury' items, such as the sit mat and possible some of the spare clothing I carry on trail. However, the sit mat only weighs 25 grams and whilst the total clothing weighs three quarters of a kilo, I believe due to the inclement weather in the UK, this quantity of clothing is necessary to stay healthy and warm. You are invited to 'shake down' the rucksack and contents as I would appreciate your thoughts and comments.