My line manager recently resigned, a new director has taken over the team

in my first conversation I have with the new director he tells me "You are going onto a PIP".

I was pretty shocked as had no warning from anyone, written or verbal, that this was coming.

I was already feeling stressed prior to this and this tipped me over so I have been on sick leave for past 2 weeks and just been signed off for another 2 weeks.

(I have had virtually no sick days in 12 years prior with my employer).

The PIP objectives themselves have not yet been discussed or agreed / signed by me.

My questions are

1) Has correct process been followed for the PIP? (i.e no warning is required?)

2) I learnt yesterday that because I am on a PIP my boss has option to only pay me Statutory sick pay and that's what he has instigated for next 2 weeks. Is this legal even if PIP has not been signed / formally agreed with me?

3) Linked to 2) as this was unexpected (it places potential financial stress on me when I am already off with stress).

Is that fair or does impact on me not matter?

Thanks in advance for responses

p:s - Background is below if this helps with responses to the above

I have been with my financial services employer for 12 years and have always had ok to very good performance reviews over the years.

I moved roles about 10 months ago (Having been in a very stressful role previously)

The new role is very much spreadsheet reviews of very complex datasets (not my strength)

although certain aspects of the role I did well.

When I did get feedback I only got 2 pieces (one from a peer who has a "coordinating role") and one from my line manager.

My line manager didn't give written feedback just answered some questions which require a "Always, often, sometimes, seldom, never" type response. His responses were "sometimes".

When I arranged a meeting to go through his responses, he explained that sometimes I do something well and sometimes I don't (how enlightening!).

what does your employment contract say? If you have a sickness scheme they cant not pay you just because they intend to do something.

A PIP is NOT a discipinary so neither side should treat it as such.