Book
Cake
Car Cleaning Kit
Chocolates (avoid if he's diabetic)
Collection of his favorite movies
Compilation of your videos together
Coupons (Click here for reference)
Digestive Biscuits (lot of them!)
Earphones/Headphones
Greeting Card (made by you or bought from the store)
Grooming Kit
Hard Disk
Homemade cookies/cake/chocolates
Massage Pass (he's always so tired!)
Meal (you can cook his favourite dish)
Mug
Pen Set
Perfume/Deodorant Set
Photo frame (with a collage or a picture of you and him)
Reasons why your dad is the best (in a photo frame or as a card)
Shirt
Slideshow of your pictures together (include childhood pictures)
Something related to his favourite sport
Spending a day with him
Sports tickets (for you and him)
Tablet (or a Kindle)
Tea (green tea or his favourite tea)
Tie
Tools Kit
Wallet
Watch