Is it worth doing headgasket on 2006 vrs estate with 136,000 miles

 

There is still probably more value in the car than the cost of the job. Only you in your particular circumstances can decide if it is worth doing, or just scrap it.

As above reply, how is the condition of the car otherwise, are there other problems, does it drive ok.  Cosmetically what is the condition. What is the price of a few independent places to quote for the work? Out of that, you have to make a decision, there is not enough information to offer a credible yes / no.

Pour some K-Seal in and don't worry about it.