Thank you for the help.
I still have a problem with the page Enquiries/boatenquiry_insert.
If I open index.php in a browser (F12) and from the menu open Manufacturers/Search by text
select a boat this opens the page boat-details.php
On the page I click the Request details button this take me to the page Enquiries/boatenquiry_insert.php?
The page appears correctly but if I make a mistake and do not fill in the required fields ie Name* and email*
and then click the send button the message
Please enter your name and Address appears OK but the boat details disappear.
I suspect this maybe something to do with Persistence but I cannot see how this can be inserted correctly.
If I then go back to the menu to start again when I reach the page Enquiries/boatenquiry_insert.php?
the messages Please enter your name. . and Please enter your email address. are not hidden.
Thanks for your help I hope I have made this clear.