Moneysavingexpert is incredibly useful. There are articles about just about everything you can think of to do with money except, ironically for you, investing.
A good 'sense check' is their money makeover. Maybe once a year or so, just skim through it and do what's relevant - check/change gas and electricity etc.
Also sign up to their weekly email, to pick up ongoing tips and do what you think's beneficial. As you're quite comfortable, you may not think it's worth scratching around for the odd freebie here and there, but it's a useful reminder about utility costs, thinking about what you're paying for broadband etc, because you can save hundreds of pounds a year on basic bills, just by shopping around.
What I'd be most concerned about with an IFA is whether you're getting value from whatever you're paying them, ie is your money making enough extra over sorting it out yourself to cover their fees.
As standard rate tax payers you both have an allowance of £1k pa for interest, and a low risk way to account for a lot of the money is to put it in instant access cash, which will pay around 1.5%, some fixed term products that will pay around 2-2.5%, premium bonds might be useful, and you could probably look at index tracker funds, which is a bit more risky but considered fairly low risk and a reasonable chance of performing better than cash, over the long term.
So you need them to beat all that by enough to cover what you pay them (and the charges in the products - tracker funds might have an annual management charge that is over and above what the IFA charges) and hopefully more - do you know what you do pay them?
Pensions - you want to be in your employer's pensions because they will contribute and you get tax relief so it's worth much more than what it costs you in terms of how much your wages reduce by.
Also it's a good time to look at the impact of having DC - reduced income due to parental leave, any childcare costs, are either of you looking to SAH/go part time?
And life insurance/income protection once you have a child to think about as well as a partner, although you might think you have sufficient resources already, as if the worst happened, you have the mortgage free house and significant savings, which should allow the surviving partner to carry on without working for a good few years so not needing to cover childcare etc. Or maybe only basic life insurance and not bother with illness cover etc, which is expensive - so probably better to self insure.