It's easy to have the boot open automatically and fully on XF.
 
	I replaced the small rubber grommet that the spring pushes against on the boot with a slightly thicker one. You have to drill a small hole and use a self tapper. Be careful drilling, don't go through the outer boot !!
 
	Then £18 worth of new gas struts from eBay.
 
	job done in 30 mins and now it springs open fully every time.