'Your estate should have plenty to cover it if you are leaving a house.'
The problem with this is that probate can take months.
I think putting money aside and writing your wishes/will might be a better idea.
FWIW I do not think many plans are a rip off. The ILs want cremation and went with the Co-Op. It's pretty reasonable. Keep in mind full on adult funerals can cost in the region of £5-6K in many minimal instances.
There is also the cost of a headstone if you desire one. We just bought one for DD1, didn't realise there is 20% VAT charged on them!
£1900 and £320 of it VAT. And it not overly huge, etc.
Because our daughter was a child, the funeral director only charged £400 for absolutely everything - collecting her from hospital, treatment, family viewing the day before funeral and internment, cars, services at church and at her lair. The director himself attends childrens' funerals and directs them all for the families.
The greatest cost aside from the stone was the actual lair/plot, which was £1100.
Keep in mind, too, that council plots/lairs will have different rules than Church-owned cemeteries.
It is actually responsible forward planning to really look into this and make some sort of plan or provision in writing.
Nothing 'grim' or morbid about it. Everyone dies.