as previously mentioned on your first post , it is a bit late now. better done in the autumn.

if you decide to split it now you will need to give it plenty of water for several weeks [possibly not a problem with the weather!]. then you may find the flowers fail to come into flower.

up to you. if you have to spit it then fingers crossed.

They are difficult to split as the are very hard in the centre and you do risk making a mess of it if the flowers are already coming up. Best to wait as Seaburngirl says.

thank you