Okay, great! Thanks for confirming that. That's just what it should be.
The good news is that this is indeed one of the Wedgwood "Fairyland Lustre" patterns, however they are not marked in the usual way with the pattern number to show this and hence your understandable puzzlement over them.
The shape of the vases is correct, this is Wedgwood's shape # XXXXX which was either 8 or 12 inches -and you have already mentioned that yours is 8 inches (21 cm).
The red number 10 on the base looks like it might be a pattern number but is not. It's a decorator mark. The ".Y" and the "w" are also decorator marks, the individual paintress tally numbers.
These vases should also have a pattern number 'Z 4832'. This is the code for this particular pattern of butterflies on a white iridescent ground and a mottled orange interior. If you Google "Wedgwood Z4832" you will pull up dozens of examples similar to yours.
All these Fairyland Lustre patterns had four digit numbers preceded by the letter 'Z'.
I am not sure why the pattern number was omitted on yours. It was typically written in gold by the gold decorator, however it's not unheard of for it to be missing and should not affect value.
This wonderful pattern is one of the many famous Art Deco lustre patterns designed by Wedgwood artist Susannah Margaretta "Daisy" Makeig-Jones and was produced, I believe, from 1914 to 1929.
If you were to list these on eBay, or sell them at your local antiques auction house, they should sell in the range of £500 - £800. They therefore have a retail or replacement value of £1600 and is what you should insure them for.
I do hope this helps!
Please let me know if you would like me to explain or expand on the above, I would be glad to.