Independent and impartial corroboration is very important when making bold statements to potential clients - especially when it's about money.
Here's a particularly valuable endorsement because it's from Martin Lewis's consumer championing website MoneySavingExpert.com (scroll down and you'll find it)
“…you may be able to negotiate a better deal by using local brokers and putting all the policies through them.”
And here's one from the UK government sponsored MoneyAdviceService.org.uk.
"...even with run-of-the-mill insurance they can often find you better cover at a great price"