It is a bit of a pain especially if you lose 3.99% of every sale to the bank for processing each payment. If you do £5,000.00 - £6,000.00 a month and endeavour to get most of them to pay by card, you end up losing hundreds!
The other option is to charge the custy the extra to cover yourself (like most industries), either by telling them the handling fee involved or incorporating it into your quotations. The last I heard, the best deal for processing payments was with the Bank of Ireland who only charge 1.5%

so forget Natwest, Barclays, HSBC etc.
To be honest you could do without it, just by informing them initially that cheque (or cash) is required on the day. The theory behind CC payments is that they would be willing to spend more with you - but we never found that
