Are you embroidering by hand or machine? Are your quilt blocks already pieced and quilted? Here are some options: if the blocks are not already quilted, you could use a light box or window and trace the lettering with wash away / iron way pens or chaulk pencils.
If you cannot see through the fabric, you could use the saral paper or dressmakers carbon to trace the text on top of the fabric. Another option could be to use freezer paper and iron it to the fabric. This would work similar to Press and Seal. Not sure what that may be called in the UK. Also, tissue paper (gift wrapping paper) pinned securely to your fabric may also be fine.
Hope you find something that works for you.