There is a fair amount of discretion exercised by the Entry Clearance Offficer in these matters, there is no strictly applied crtieria which you can use
There is a view that a vistior should not spend more than 6 out of any 12 months in the UK under vistors visas:-
See VAT1.5 Frequency and duration of visits on the above link. I would use this as guidance and not spend more than 6 months out of any 12 here.
You should also take evidence of your return journey details (eg. booking of flight) each time you travel.
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I mean you should not spend more han 6 months out of any 12 month period within your 10 year visa in the UK.
150 days since last april 150 days out of nearly a whole year so that is within the limit. You should be okay. Make sure you take evidence of your travel insurance and return flight tickets though just to verifiy that you will return home.
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