What would you do in my position?

Type_45

Yes, I could l leave the £75k in VLS100 and in future look to put additional money in less volatile investments - bonds, gold, (or even VLS20? Or are there better bonds out there?)

I also notice that no-one has suggested paying off any of the mortgage right now. This is probably because VLS100 gains ~7% per year, and the mortgage (at the moment) costs 0.85% per year. But it's not worth at least chopping down the mortgage even a little?

MX5huggy

If you want to be told to pay off the mortgage post on the Mortgage Free Wannabe board. 

But you seem a bit of a gambler, happy to go high risk high volatility investments. If all you have in savings is the LS 100 and the Bitcoin I would say you’re over exposed either go back down LS scale, and count your blessings for your good fortune this year or buy some bonds with your next investments. 

Type_45

Regarding paying of the £70k mortgage within 5 years - it's an aspiration, but not essential.

Being £70k in mortgage debt when that debt is costing £48 per month is fine.

And leaving the £75k in VLS gives it (hopefully) time to grow to the point where I can pay off big chunks of the mortgage and still retain a decent amount of VLS holdings (as I say, I'd like to think it won't be long until I have over £100k of VLS).

The crux of the issue I guess comes down to there being a crash...  The VLS loses half it's value for years on end and the mortgage goes up.

That being said, and as I said earlier, I don't have any plans for the VLS £75k anyway and it can recover without me needing it.

At the moment I'm thinking either leave it in VLS100 and hope the governments keep printing money for years, kicking the can down the road, and inflating the VLS100 price.... Or, hedging my bet by going down to VLS80...