For vehicles used before 1st April 1985, the windscreen and front side windows must let at least 70% of light through.
For vehicles used on or after 1st April 1985, the windscreen must let at least 75% of light through and the front side windows must let at least 70% in.
There are no restrictions on rear windscreen or rear window tints.
50cc
legal age limit is changing to 17
In the UK I believe it is 3 years.
any age all over the country
Nope, they can put as much as they want in it.
Where practical, at the age of 11 the children must have another room to sleep
Tinted moisturizer can be purcahsed from many outlets. In the UK it can be purchased from stores such as Boots or Debenhams. In the US it can be purchased from stores such as Sephora.
Almost all types of window decals are legal in the UK, because they don't really care on what kind of windows you have, as it's not pertaining to danger. Cheap ones can be found on eBay, but it could be from Hong Kong or Shanghai.
Firecrackers are legal in the UK but fireworks are not Legal. So you can bye fireworks in the UK but not firecrackers.
There is no age limit
Depends. If you are under 18 then technically you are still under the control of your legal guardian and cannot leave without their permission.
Ferreting is both legal and popular in the UK.