Can I clarify something, if the broker ‘gives you’ 7 years NCD discount, he is only giving you a discount, when your years driving is up you will only have 1 years NCD. You will then have to tout yourself back to that broker who will then probably not give you anything more than 1 years NCD. You can’t cherry pick the insurance market otherwise everyone out there would be getting false letters from their employers claiming a perfect driving history.
Their imaginary NCD’s are worthless to most of the insurance market. It’s not different to when car manufacturers offer ‘VAT free’ deals, they are only offering a discount equivalent to VAT and in this case a broker who block buys policies from a scheme is hedging his bets that you won’t claim from that scheme’s fund. They calculate risk in an entirely different way to ‘normal’ insurance companies who would use your NCD.
Therefore, the OP needs to do everything they can to keep that NCD because it’s useful to the whole market, not just a handful of scheme brokers, Adrain Flux being the biggest in the country.