Quote from the letter I received the other day.
" We will arrange to withdraw your holding into your own name on or around 13 May 2019. If you hold the
shares within an ISA they will be removed from the tax wrapper unless you make alternative arrangements prior to this date.
If you hold your shares in a SIPP or a CTF account we are not permitted to transfer your holding into your own name and will
therefore hold the underlying Shares residually (outside of CREST) on your behalf"
I followed this up with a phone call to my isa provider Equiniti who confirmed that they would send me my share certificate(s) after May 13th
From what I’ve read on the forums, people are panicking and this is because each provider is handling and wording the situation differently.