I would go with the lower charges. Paying a fixed % every month for advice is questionable as the advice does not guarantee you any better return. If you are willing to do so, then better to take control and educate yourelf in managing your own pension then pay for some advice as you near retirement if needed.
You are 45, pension rules will change many times between now and retirement so advice you get today may well have little relevance in 20 yrs. Many people with DC and ARF funds have seen this recently. If you are willing to take an active role then imho it is best to keep up to date yourself through the pensions board and forums like this.
It's your money, don't be like my dad who in the 1980's blindly give a lot of money to an Irish Life pensons guy who called to the house every month and told him everything was great and to put in more. It was great for the pensions guy. These guys are still around, they just don't call to doors any more.