BTEC isn't a mickey mouse qualification. Most Agricultural colleges will offer either BTEC 1st or Nationals at GCSE and "A" level equivalence respectively. Some will offer degree equivalent highers. In addition you would usually also study to gain NPTC eg felling small trees, tractor driving, use of firearms etc.
I wouldn't dismiss BTEC. If you do you are going to find your choices very limited.
The secret is to find out from your college what units they offer, For example the BTEC National has over 20 units including use of firearms, shoot management, deer stalking etc.
Bob