Well there is the low power PL450B, it is single mode, but I don't know how much power you want. We don't know much yet about the new medium power PLP450, so I wouldn't even buy one just yet until a few people have one for awhile or until we have a data sheet for it. I do however have a PLTB450B and it has a smaller dot than my M140 or NDB7875, and it does 1913mW with a G2 lens, it is just slightly a different blue than the 445nm diodes. If you get one be sure not to accidently set something on fire. I have a 462nm module here but I can't comment on it until I have built the laser. I don't buy pre-made lasers, just parts, that way I know exactly what I have. I see you are in the U.K. You may want to buy a parts bundle from member Grix:
BitLasers minimal assembly required and ships from Norway. Sci-Fi Lasers is good, also owned by a member here:
Home ships from Israel.
OdicForce In the U.K. May have something of interest. There are also the part bundles sold by
Survival Laser International Home also owned by a member here and ships from the U.S. I am not sure what all countries they ship those to, again very minimal assembly is required.
Alan