Agapanthus help

[Graeme]

I seem to have ended up with a lot of named Agapanthus varieties

They tend to live in one of the tunnels and some are now in serious need of re-potting as they are bursting the pots

Does anyone have any tips for compost recipes or advice

I was thinking of 1/2 multipurpose and 1/2 composted bark chips?

[Gail]

I seem to have ended up with a lot of named Agapanthus varieties

Me too, amongst all the other things I seem to have ended up with...
I use around 50:50 multi-purpose (whatever is on special offer) and John Innes no 3 with some flint/horticultural grit thrown in if I have some around, but get them in the ground for preference (even those which 'the experts' claim to be tender).

This is 'Silver Mist' in my last garden in Suffolk - I was told to protect it in winter but never did and it flourishes.

[Jeffnz]

Agapanthus are definitely frost tender but amazingly do recover when growth returns. Here they are usually garden grown and can cope with a variety of soil types. The root system even with dwarf varieties are 'robust' to say the least (try digging an established plant up).
Not familiar with UK potting mixes but any well drained mix should suit them.