The only comment I'd make is that special roast is a little more 'biscuity' version of biscuit proper. So along with Maris Otter's toasty character, it would give you a pronounced biscuit/toasty thing. Not that it's a bad thing, just worth passing the info on. Personally, I like MO without biscuit or special roast, but it just depends on what level of that character you like.