Height barriers - no information on website

We have a small motorhome and love birdwatching.  Unfortunately, my wife has limited mobility and can't walk for more than a mile or two.  Today we travelled to RSPB Snettisham only to find a height barrier. This meant that we had to walk an extra 3 or 4 hundred metres both ways.  

I fully understand why you feel it necessary to fit height barriers on the entrance to some sites. However, it would be really helpful if you could say on your website whether or not there are height barriers on sites and where alternative non-height restricted parking is available at all your reserves. 

Thanks