The terms 'wealth manager' is often adopted by an IFA who thinks he's more than he is well it is usually a bloke Often you tend to pay for this fairly handsomely at ~1%. I feel that you will be paying over the odds.
DFM's are also often 1% up to £1m however an IFA with a strong relationship will often get their services for less. Certainly 0.75% on the first £500k. The key here is not to pay for a fund of funds manager. You can find investment houses that do a better job, and effectively do the same thing.
I monitor the performance of the funds and managers I use on an inflation + basis. They like to create all sort of benchmarks, often using their peers performance! My response on that is 'that just makes you first amongst morons, how does that help me'. Data is essential though and this is often overlooked when people are funnelled into stuff on services such as Hargreaves L.
I like Vanguard Lifestrategy and use it a lot. I also use it as a bench mark for my DFM ' if you can't beat this, why am I paying you'. He's good, he does and I wouldn't chuck him out on a bad year as he has a long track record.
My DFM is good at getting money into the market. Large amounts going 'in' carry a level of jeopardy. I want someone good, with speed, and liquidity. They are good for CGT burdens and other tax issues. They can tailor a strategy for engaged clients. Often IFA's hide behind them IMO.
Sometimes an IFA can save you from yourself. Too much trading, not enough granular detail on legislative issues that will impact. Opportunity cost of misaligned investments. No re-balancing. No disinvestment strategy. No income strategy separate to a growth strategy.
However all said and done it's about ensuring you are getting enough global equities into your portfolio, not getting too distracted by all the other asset classes. Risk is a funny thing, it's too great a distraction in most cases, but most retail clients get too bogged down in it, driven by a focus on downside risk from the top down (FCA)
Anyway, packing up my soap box!