Hey skateandcreate,
It doesn't get much more "partial" than that.
The degree of difficulty in determining the maker from this small shard is extreme.
"The willow pattern has been made by hundreds of companies in dozens of countries, and in colors from the most-seen blue, to red, green, gold, yellow, purple, black, brown, multicolored and the list goes on with combinations.
Did you know the willow pattern has earned a rather unique distinction? Because it has been in existence for more than 200 years, it is the china pattern with the longest continual production in history...
By 1830, there were about 200 makers of underglaze blue willow in England. Toward the end of the 19th century, other countries followed suit, and by 1905 the Buffalo Pottery in the USA began making standard willow pattern using the transfer printing method..."
International Willow Collectors
Having said that, you may wish to contact the specialist group:
International Willow Collectors to see if they might recognize that corner of a marking.
Here's several thousand British marks you might pour over:
Pottery & Porcelain Marks - Great Britain - Pg. 3 of 38
"Two birds flying high,
A Chinese vessel, sailing by.
A bridge with three men, sometimes four,
A willow tree, hanging o'er.
A Chinese temple, there it stands,
Built upon the river sands.
An apple tree, with apples on,
A crooked fence to end my song. "
Antique Blue Willow