htaccess issue in accessing the directory - apache

Question

My Blog link is http://www.example.com/blog when i am trying to access it it converts the url into http://www.example.com/blog/?ID=blog which is not correct. But when i put the backslash at the end of the blog it works fine but i don't want this back slash at the end
I try to change every thing inside htaccess file but failed.
Here is my htaccess file
Options +FollowSymLinks
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f [OR]
RewriteCond %{REQUEST_FILENAME} !-d [OR]
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule ^ - [L]
RewriteRule ^products products.php
RewriteRule ^websitemap sitemap.php
RewriteRule ^aboutus aboutus.php
RewriteRule ^clients clients.php
RewriteRule ^shoppingcart inq.php
RewriteRule ^contactus contact.php
RewriteRule ^finished finished.php
RewriteRule ^product/([a-zA-Z0-9_-]+)$ product_large.php?ID=$1
RewriteRule ^([a-zA-Z0-9_-]+)$ category.php?ID=$1
RewriteRule ^([a-zA-Z0-9_-]+)/([a-zA-Z0-9_-]+)$ products.php?ID=$2&MID=$1
ErrorDocument 404 http://www.example.co.uk/error404.php
RewriteCond %{HTTP_HOST} ^example.co.uk$
RewriteRule ^/?$ "http\:\/\/www\.example\.co\.uk\/" [R=301,L]

Answer 1

Insert this rule after RewriteRule ^ - [L] to force a trailing slash:
DirectorySlash On
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{THE_REQUEST} \s/+(.*?)[^/][?\s]
RewriteRule [^/]$ %{REQUEST_URI}/ [L,R=301]
RewriteRule ^blog(/.*)?$ - [L,NC]
# your rest of the rules