The closing price for Bitcoin (BTC) in terms of GBP in May 2015 was 151.44, on May 31, 2015. It was down 2.4% for the month.

DATE	OPEN	HIGH	LOW	CLOSE
May 31 2015	152.51	—	—	151.44
May 28 2015	154.93	—	—	155.33
May 27 2015	154.44	—	—	154.98
May 26 2015	154.16	—	—	154.45
May 25 2015	155.78	—	—	154.15
May 24 2015	154.51	—	—	155.78
May 21 2015	149.44	—	—	152.04
May 20 2015	149.29	—	—	149.45
May 19 2015	150.31	—	—	149.32
May 18 2015	151.38	—	—	150.33
May 17 2015	150.04	—	—	151.30
May 14 2015	149.78	—	—	150.69
May 13 2015	153.34	—	—	149.86
May 12 2015	154.56	—	—	153.16
May 11 2015	154.20	—	—	154.57
May 10 2015	156.53	—	—	154.19
May 07 2015	148.95	—	—	153.78
May 06 2015	155.04	—	—	150.73
May 05 2015	157.38	—	—	154.91
May 04 2015	158.98	—	—	157.46
May 03 2015	155.17	—	—	158.98

Daily pricing data for Bitcoin dates back to 7/13/2010, and may be incomplete.