NO! DO NOT START TRAINING NOW - or within the next 1-2yrs.
The airline industry is in MELTDOWN at the moment. Despite what FTOs are saying, it will take YEARS and YEARS to recover from the severe downturn we are in - and we still havent reached the bottom. IATA has doubled its original estimate of airline losses for this year. NO AIRLINES are recruiting at the moment (except for hold pools or pay to fly schemes). And they wont be recruiting for YEARS.
My advice would be take option 2 - got to UNI but do a "proper" degree. City flight ops degree is useless outside aviation so if you want a good backup plan for another career then look somewhere else.
OR get a job after your Alevels and work for a few years.
We have all been in your position of "WANTING IT REALLY BADLY and BECOMING A PILOT". However now is not the time to take the plunge. Remember the average age of Integrated students is 23-26. So you still have ages of time to start training. Dont rush into it because you have no rush.
Hope that is of some help/insight and good luck.