I've ordered from Rockatuo before... here's some help on some of the questions you asked:
Quote:
by the time shipping, import duties and VAT are added
On the top of the webpage there's a tickbox for included VAT... look to see if it's checked or not... if it was checked, then the prices you saw included VAT 
If not, tick it and it will add the 20%. No customs etc. to add on as they are a registered VAT collections agency etc. 
Quote:
does your discount code include the P&P charges as well?
Yes Quote:
Is there a feature to combine shipping costs on your website if I order more than one item?
Yes - it will combine when you go to the cart page, you then have several types of delivery i.e 3 day, 5-7, 11 etc. You can play about with the different options as it updates the final price straight away. If it's coming from different warehouses, it will indicate this by a lorry with 'A', 'B' etc to show which item is coming from which warehouse. You can then change items to try and get them all from one warehouse to make shipping cheaper. The cheapest option is 'economical' which combines other peoples orders going to the same destination so it ships bulk style. Quote:
Is everything shipped in from America or are some parts dispatched from Europe
America, they are based on the East side. I've found that whilst the shipping price can be a little bit high, overall, the price is pretty decent and on par, or cheaper than UK resellers of parts.
