Smith and Allen online are usually a pretty good price, they are who I use..
Do you not have a motor-factors nearby?
Anyone you buy off online will charge P&P which for oil could be a significant percentage of the price (weight). A decent motor-factors (most towns have a few) will stock all types from a variety of manufacturers.
Is halford really that much more? You may end up paying more in fuel/postage than just pooping to halfords...
thanks for that comment just searched the differences. would of fooked me gearbox up using gl5.gl5 dont use in gearbox.
i've searched high and low for ep90 oil as doing a complete overhaul on my series and the cheapest oil i have found is on ebay Triple QX EP90 Transmission Fluid 5 Litre (5L) API GL-5 | eBay
can't say no to £16.20 for 5 liters