An alternative may be to do place accumulators on
Betfair, then you would have say, £2 on them all to place, rather than having a £1 ew treble where you only have a quid on them to place (as the other quid is on them all to win).
Not tried these
Betfair accumulators myself, although I think you can only do them at one meeting at a time. i.e you have to pick horses from one card, such as newbury, but can't do, say one horse from newbury and two from York.
Can anyone else shed any light on this?