Drip feed or lump sum ? It depends on how soon you need to access the money . Over the medium - long term ( more than 10 yrs ) it`s probably best just to dump it all into the chosen investments ASAP .
MM funds still looking OK though @ 5.25 % , although we don`t know how long before these rates may be cut .

Hi NigT, welcome to the forum

The scenario you describe is a common one and is possibly summed up as "how do I decide what asset allocation is best for me"?

Maybe to begin it's worth trying to model broadly what investment return you need by looking at your best guess of income and expenses over time.

I say this because up until January 2022 I was (unknowingly) targeting a return that was far higher than I actually needed but was also feeling very uncomfortable with the risk of a crash at that time.

So I swapped to a 50%;50% allocation and then put more focus into understanding what return I needed as opposed to the one I would like. Loads of number crunching ensued.

Check out the postings of Elspeth Beaton (formerly xxd09) who writes about it mattering less about the allocation you choose and more about sticking to that allocation through thick and thin.

I agree with this and have lived a more peaceful couple of years at 50:50. There is no point in 70:30 or higher if you are likely to panic at the wrong moment.

I'm happy to expand on how I modelled everything to find out what return I needed. But that's where I would start if it were me.

James Shack on Youtube puts out some good stuff on this topic and he has helped me over time.

I’d ask myself a few questions:

How big a market crash do I fear? 20%? 40%? 50%?
Why do I fear it? What are the consequences ?
How do I feel now and how will I feel then?
At what level would I decide that’s enough of a crash and I’ll now invest?
If I can’t decide to invest now, why will I be able to decide to invest then?
How much of a permanent value loss can I tolerate?
What are my objectives and what needs to happen to achieve them?
What decisions does this constrain? How much risk ( defined as permanent loss of capital) can I afford to take?
What scenarios would be a real problem and how do I mitigate them?

On at least a ten year horizon, permanent loss of capital on the 70/30 or indeed 100/0 strategy is very low.

Without knowing all the circumstances it’s impossible to give a full answer. However, the strategy of 70/30 or similar in low cost index funds looks broadly sensible. Delaying implementing is on average going to be a poor decision but markets can and do crash. Drip feeding will reduce the *regret risk’ of an immediate large crash but on average markets tend to rise and there is some cost, on average, to delaying. But make your plan and stick to it, including whatever planned actions you have for particular market outcomes. Otherwise you will get caught in the headlights and get run over by the juggernaut of events. Did I really write that? You get the idea.