I have read all the debate over which grade of oil to use in a UK TD5 and I will stick with SAE 5W 30 semi-synthetic as I have used before.
On saturday I saw the aforementioned spec in ASDA for £19.95 for 5L but it said on the container it was for Ford engines. Does this matter? At that price are there any pitfalls? I change annually and cover about 4000 miles in that time

depends for what kind of Ford engines is designed, if it's for diesel unit injector equipped engines it's good cos unfortunately they didnt develop a special oil for the Td5, the most compatible seems the oils for VW unit injector(Pumpe Duse) engines...cos that's what the Td5 is... that's in case you want the best for your engine, if you just want to lubricate it any oil is good...or at least make sure it's not stated on the oil to not use it this kind of engines cos there are cases like that too...the fact is that this electronic unit injector technlogy is sensitive to oil cos the electric part of the injector is within the oil so fully synth oil is recommended cos it has a much lower electric conductivity than the mineral oils.

^^^that's the theory now you decide

Thanks Sierrafery, is there any particular brand of oil you recommend?

NO i dont like to recommend brands... but i recommend fully synth designed for diesel PD/unit injector engines, and read carefully to not be like this one which is stated with exception of unit injectors

find something like this for example, specially designed for PD/EUI engines Fuchs TITAN GT1 5W-40 Synthetic engine oil - BMW, Mercedes, Porsche, VW & more