There is no definitive answer to this question, as the cost of a trailer license can vary depending on a number of factors. However, as a general guide, the cost of a trailer license in the UK can start from around £50.
There are a few things you need to take into account when budgeting for your trailer license. Firstly, the cost of the license itself will vary depending on the weight and size of the trailer you wish to tow. For example, a license for a small trailer up to 750kg will typically cost less than a license for a larger trailer over 750kg.
Secondly, you also need to factor in the cost of taking a trailer towing test, which is required in order to obtain a license. The cost of the test itself will vary depending on the provider, but is typically around £100-£150.
Finally, you also need to consider the cost of insuring your trailer. This will again vary depending on a number of factors such as the value of the trailer and the level of cover you require, but is typically around £100-£200 per year.
Taking all of these costs into account, the total cost of obtaining and maintaining a trailer license in the UK can therefore be anywhere from around £250 to £500 per year.