Don't go anywhere near single mass conversions.  
A DMF and clutch for £249??  It will be utter dog sh1t.  Trust me, I've fitted a LUK DMF from Eurocarparts and it last 18 months before rattling. Absolute trash.  There's a reason why the dealer charges £700 for them.  They are better made!
AKS Tuning do a LUK DMF which is apparently a stronger version from the S3/6R (didn't know such a thing existed) for £340, but again, it's a pattern part.  It won't last.  The factory DMF on my ED30 lasted 9 years. Change it out for a cheap pattern and it lasts 2.  Go figure.