yes its my husband that arranged this, its done today to coincide with our wedding anniversary, 6 years today.
He phoned them and they said that they give you 2 scans 1 at 18 weeks and ask you to come back at 22 weeks just to be sure, as they say at 18 weeks they can only be 97% sure, but they said that they are never wrong at 18 weeks, 22 weeks scan is just to be sure. There is no extra cost for the 2nd scan, so 2 scans for £75