What do you mean by a cross-bet? I’ve never heard of it and I know a fair bit about gambling. Why were you charged £3? The £1 E/way double costs you £2. What is the other £1 for? Is it something to do with the “cross-bet”?
In fact there are six possible returns for your place double, depending on the odds for a place offered by your bookmaker:
7/2 (one-fifth); 14/1 (one-fifth) = £6.46
7/2 (one-quarter); 14/1 (one-fifth) = £7.12
7/2 (all-up); 14/1 (one-fifth) = £17.10
7/2 (one-fifth); 14/1 (one-quarter) = £7.65
7/2 (one-quarter); 14/1 (one-quarter) = £8.44
7/2 (all-up); 14/1 (one-quarter) = £20.25
But I’d love to learn what the “cross-bet” is.