Had a quick google on the MRP Bling ring and it seems most run it with sram x0 cranks, presume these don't need filling?
Chain Guide only go's down 32t so will sort a new one of them out to.
Can't beat new bits!
You don't have to use an x0 crank, there are x7, x9 and others which can run a spiderless chainring. No you don't need to do any modification. Standard cranks with a spider have to be filed slightly the chain will foul the chainring tabs due to the smaller diameter of the chainring.
Yep there's not much you can use with a <32t chainring at the moment, MRP also do a micro guide which goes down to 28t. In the past I've used a blackspire stinger and/or an n-gear jumpstop (both work well together) at the moment I use a blackspire innerguide; this is like a thin bashpate bolted to the granny tabs, this combined with my bashguard sandwiches the chainring, I've not dropped a chain since running this setup on my Blur.
Anyone know of any good trails in the Cheshire/North Wales area?
I only really have Delamere close to me, and I'd like some variety

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Er, yes
North wales: Llandegla, Coed y Brenin, Betws y Coed, Penmachno, Antur Stiniog, plus miles and miles of natural trails, it's an amazing place to be close to.
How do you guys keep your chains in tip top condition? Especially after a super muddy, gritty ride.
I do this after every ride at the moment since our weather is crap. Give it a scrub with a brush or if you've got a bit more time, do this then run it through with a chain cleaner (I've got a finish line one) using degreaser, then regrease each link with the lube of your choice (I use finish line wet lube) and wipe off any excess.
In my opinion wet lube is pretty essential in our country but it obviously attracts tonnes of dirt, I've got into the habit of cleaning my chain after most rides and it seems to be running smoothly all the time. It's a good idea to give your cassette/jockey wheels/chainring a quick scrub too, this only takes a couple of minutes.