Error in validating <p>..</p> structure

Hi folks:

Page http://www.fbannisterelectricalservices.co.uk/index.html includes 
(at line 100):

<p class="layout1"><h2>Email: <a 
href="mailto:frankbannisterelectrical@gmail.com">frankbannisterelectrical@gmail.com</a></h2></p>.

The html5 Validator produces this error message:

Error /Line 100, Column 129/: No p element in scope but a p end tag seen.

This comment is itself an error - the line is a p element!

Comment please.

Regards

D M Swindlehurst