To give you a guide on prices, I use the 'service wash' at a launderette.
I took two really big bags in there this morning. A few hours later I collected those bags, fully of clean laundry. Everything was neatly folded and sorted, with around 30 pairs of socks all paired together. That was one month's washing for me. The total charge (including use of the washers and dryers, washing powder and the service charge) was £16.00.
I don't currently use the ironing service at the launderette (as it adds too much to my costs) but I believe that they charge around £1.40 per shirt or about £2.50 to press a pair of trousers, with all items being placed on hangers inside plastic covers. However some places charge by weight, rather than 'per item':
http://www.ironingmaids.co.uk/4.html