These British Army surplus MTP blanking patches are sold in pairs and designed to fit onto such as shirts, jackets and UBACS.
With full or part hook and loop Velcro on the rear, they attach onto the arm panels and can have tactical recognition flashes or identifier badges sewn on as required.
All the patches are in MTP and some include a small Union Flag in the corner. Sold in pairs, at least one of the patches with have a union flag, possibly both.