How are you funding your BTEC? What age are you?
You are sometimes able to use first year of the degree to then transfer to a brick uni but you would need to check with the brick uni whether they would accept it-it is more common for them to accept it as entry into first year instead of being able to go into second year though that depends on the uni.
It is also worth noting that if you did both of your year one modules starting in February you wouldn’t have your results through in time to be able to go to a brick uni in 2021. Also, you’re funding would probably not work as you would have already studied the maximum amount of credits in the academic year. If you mean to start one module in Feb and then another in October for transfer into a brick uni at 2022 then these points are moot (tho if this is the plan then it would possibly be better waiting until the October start date for both modules and following the normal academic year.
I’ve just graduated from Psychology with counselling from the OU and loved it so much I am continuing with them for my masters.