Premium Bitter Recipe

Hi! I'm thinking of brewing a premium bitter (not ESB) and I was hoping you could tell me what you think of my recipe

5 gal batch

OG: 1.048
Bitterness: 30 IBU's
SRM: 13

9lb-Maris Otter Muntons
.85lb-Crystal 75 Northwest
.03lb-Roasted Barley (for color) Briess

.53 oz Target-60min
.35 oz Northern Brewer-15 min
.35 oz Perle-15min

Mash at 151 F for 60 min
Fermentation at 64.4 F 1 week
Secondary 1week
S-04 or US-05 fermentis yeast

Thank you for your comments

Looks good. My preference for a color adjustment would be chocolate malt or Carafa and use the UK yeast.