In reply to jthet:
I cut the top of the shoe and shape out the shoe with packed tissue and newspaper. May sure the tissue offers a neat face to the outside as this face shape will be touching your foot when the glue sets.
Fill the slot ( possibly T shaped ) on the outside with Shoe Goo.
Leave a day then pull out the tissue.
Repeat if you get the new shape not quite right.
I get shoe goo off fleebay. Be careful with tube size, some listings are misleading.
SHOE GOO CLEAR-110ml /3.7oz Glue/ Adhesive-FREE NOSSLE FREE P&P.1st CLASS POST £5.49
Post edited at 18:04