Upvote:4
The UK does not place a formal limit on the number of visits or their cumulative duration. However they do have a rule that visitors (whether on Visas or Visa-free) must not try to live in the UK through frequent or successive visits. Spending nearly half your life in the UK is IMO getting dangerously close to living in the UK.
Unfortunately it is difficult to quantify the risks because the official statistics only talk in very broad brush terms and anecdotes mostly come from people who have had a problem, not from people who got in successfully.