Ha ha! The expert is here.
OK.
The site you should not live without is www.johnlewis.com. THis is the shop to get absolutely everything for the home, all at very good prices, fantastic service (re returns etc), immaculate delivery, it is perfect. You can buy everything for the kitchen (fridges, washing machines, ovens etc), plates, glasses, flatware, wooden spoons, kitchenaid stuff. Everything for the bathroom - laundry baskets, mirrors, scales, bath mats, towels. Sheets and valances and mattress covers etc. Lighting is particularly good. Everything basically. You can also get everything audiovisual, all electronic goods, a good selection of toys, and also furniture - beds, wardrobes, whatever. This should be your number one stop. It also does clothes but not high fashion - still, good basics. CLothes are better in the shop than they are on the net. Also kids shoes are fantastic in the shop but not on the net.
www.marksandspencer.com is also good - good basic everything. You are probably familiar with M&S.
Also look at www.tesco.com or www.ocado.com or www.sainsburys.com for groceries - see who delivers to you. Tesco also sells everything but is a bit low-end for eg clothes - very good for electricals and CDs etc though.
www.thewhitecompany.co.uk does the best and best value towels and sheets in the uk - really great quality for the price. also does some decorative accessories for the home and great towels, bedding, furniture etc for childrens rooms. nice pyjamas and dressing gowns as well. have a look - great site.
Children's clothes. www.boden.com (discount if you click through from this site). Many people clothe their children completely off this site - and you can get at least 50% back by selling them on ebay when you have finished with them. The archetypal english middle class clothes!
People like www.verbaudet.co.uk but I've never got on with it.
Wet weather clothes for children - www.muddypuddles.co.uk are excellent. Good for skiwear too. General outdoor stuff.
www.gltc.co.uk is good for all sorts of things to do with kids - eg outdoor toys, bedroom furniture and accessories, clothes (but only up to age 5 I think).
CLothes for you - I don't really do mailorder clothes as I like to try things on, but look at the aforementioned Boden, also www.monsoon.co.uk, www.netaporter.com for seriously lovely designer stuff, well edited, www.schuh.co.uk for shoes.
Furniture for kids rooms - best ones are www.gltc.co.uk (discount from this site), www.johnlewis.com and also have a look at www.aspace.co.uk for great beds with truckles underneath them for sleepovers, matching furniture like desks etc and good accessories.
Furniture for you www.oka-direct.co.uk.
Holidays - www.lastminute.com is owned by Travelocity and is good. www.scottdunn.co.uk does high end holidays with children in mind. www.markwarner.com also kid-friendly holidays. www.elegantresorts.co.uk if you are pushing the boat out. www.thomson.com good for good value package holidays. www.kuoni.com has good holidays but their site drives me mad. www.sanctuary-villas.com and www.ppa.co.uk for fantastic villas in europe.
Other sites I use are www.pedlars.co.uk for just wierd stuff, www.crocus.co.uk for the garden, www.grahamandgreen.co.uk for homewares, www.divertimenti.co.uk for lovely kitchenwares.
I'm sure I'll think of more!