Out of interest what added security is it REALLY adding?
Against redundancy?
https://www.gov.uk/calculate-your-redundancy-pay
You'd need to have been employed for a minimum of 2 years to receive anything.
I gave it a run - aged 24, with 3 years service on this contract your statutory payment would be £1075. And you'll only get it if you've been there at least 2 years. Where's the real added security? Guaranteed money per month? Profit is the reward for risk - there is more risk on Flexi and so it pays better than this contract will - you'll earn more on flexi I assure you. Pension? £100000 in a UK pension pot returns an annuity of at best £6K a year - how many £100000s are you going to save on this contract?
The only way to get more security is to leave broken Britain.
Hold out for a better contract.