IMPORTANT - You could be entitled up to £4856 in compensation from mis-sold PPI on credit cards or loans. Please reply PPI for info or STOP to opt out.
In this case, the sender's number is +447436261356 although this will change regularly to avoid detection.
If you get one of these, you should forward the spam and the sender's number to your carrier. In the came of T-Mobile, O2 and Orange the number to report to is 7726 ("SPAM"). Vodafone customers should use 87726 ("VSPAM") and Three customers should use 37726 ("3SPAM"). Hopefully the carriers will act if there are enough complaints.