Flu only was £26 including vat in Feb. Call out is a flat fee but there's a few of us on the same date my share of that was £10. Flu and Tet was I think £28 the year before.
Mine was done as part of a "job lot" of five on a zone visit day. I've yet to be told by the YO what my share will be. I'll pay her cash at the end of the month.