i have tried several printers, Hp laser1020, Deskjet 6520, PSC500 to print some text on to cards which are thick - 264g/m2, and slightly glossy on the non-printing side. Can any one suggest a printer which would do this without jamming or sliding.
For that thickness of card, I think you will need a printer with a straight feed path. The Epson R2400 click here, for example has a manual feed at the front that allows the printer to pull the card into the printer, print on it, and then feed it out the same way. This is the same principle that the Epson R220 uses to print directly onto CD's. The R2400 isn't cheap though, Amazon are selling it at £512.61 (it's an A3 printer). You may find an A4 printer with a similar feature.
Epson will be better than HP with thick card because the paper feed path is nearer to straight. Epson, however only specify 300gsm for their own ultra glossy paper, so it will depend on how flexible the card is.