You have still not claimed the compensation you are due for the accident you had. To claim then pls reply CLAIM. To opt out text STOPIn this case the spam comes from +44749353036, but the spammers rotate numbers regularly as they get blacklisted.
If you get one of these, forward the message to 7726 ("SPAM") on T-Mobile, O2, Orange or Three. If you are a Vodafone customer, forward it to 87726 ("VSPAM"). Your carrier should be able to block the spammer's number and with enough evidence may be able to take action against them.
Update: 3's spam reporting number is 37726 (3SPAM). Thanks for the tip, Richard!