Hi there Yorks.ppl
Whilst I don't know anything about operating into Sherburn, a request for a long transmission does imply the use of RDF equipment by the controller. If you are interested in reading about RDF phraseology, then CAP 413 Radiotelephony Manual Ch6 page 10 para 1.7 onwards is worth a look.
Rather than counting backwards during your "long transmission" it may be more correct to finish the transmission with your full callsign spoken slowly.
All the best
G-I-L-E-S W-E-M-B-L-E-Y - H-O-G-G