Thanks everyone for your replies.
First, let me say that I never,never,never answer or even open any emails from Paypal,My Bank or any other similar institution where I have an account because I know it's not legit. They get deleted immediately.
The problem I had here was AFTER I logged in to my account. A page came up asking me to give details of my address,Date of Birth etc and I did so. But the page was not accepted. I treid again, giving the same info that is in my Paypal Profile, again it was not accepted.
The third time I tried they asked for more info, the copies of documents to prove my identity and address.
It is impossible to email Paypal, even though they say you can, because all replies are automated [like
ebay] and I often wonder why they bother with it.
But I did email them......

....and I got........AN AUTOMATED REPLY !
I have just opened the link from wt1 and this appears to be similar to what they were writing about after I logged in, but wt1's page is much more thoroughly explained.
My Paypal account is in Luxembourg [European Office] and the total amount one can receive in payments is tiny compared to the figure in the USA...or this may just be Great Britain. Unless I phone I have no way of finding out, and I find that rather annoying in this day and age. [I will need to spend an hour listening to music I don't like and waste a lunch break or take ½day off work....Grrrrr!].
But I will not be able to buy or sell anymore if I do nothing...and so it looks like a long process is about to begin.
Extremely frustrating and more than a little sad. I just don't understand why Paypal cannot be more open and honest instaed of leading me around the garden path with forms they were never going to accept.

Here is the page that comes up on my screen after Log-in. Once I click on 'Resolution Centre' [4th from bottom line] I get the form to fill in. That form is not accepted even though it is correct and as normal.
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PayPal is constantly working to ensure security by regularly screening the accounts in our system. We recently reviewed your account, and we need more information to help us provide you with a secure service. We would like to return your account to regular standing as soon as possible. We apologise for the inconvenience.
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16 May 2012: You have received £1,650 or more in total payments to your PayPal account in this calendar year and are therefore approaching our annual receiving limit of £1,900. PayPal is required by law to comply with European Union Anti-Money Laundering regulations by collecting information from customers when they receive more than £1,900 in total payments within a calendar year. Please go to the Resolution Centre for more information on what you need to do.
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How can I return my account to regular standing?
It's usually quite straightforward to take care of these things. Most of the time, we just need some more information about your account or latest transactions.
To help us resolve this issue, please visit the Resolution Centre.
We'll review the information you provide and email you if we need more details.
Once you have completed all the checklist items, your case will be reviewed by one of our Account Specialists. We will send you an email with the outcome of the review.
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Londonbus1