Can anyone identify this plant?

gardenbanter.co.uk has been reported as a suspicious site to do so).

This looks to be Portulaca grandiflora, an annual, but one that reseeds quite readily, where it is happy.

As Pat wrote, you picked a very poor place to post your pictures and I'd suggest that you find a more legitimate host. To quote:

What is the current listing status for

Site is listed as suspicious - visiting this web site may harm your computer.

Part of this site was listed for suspicious activity 1 time(s) over the past 90 days.

What happened when Google visited this site?

Of the 40 pages we tested on the site over the past 90 days, 4 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2010-08-31, and the last time suspicious content was found on this site was on 2010-08-31.

Malicious software includes 4 scripting exploit(s), 4 trojan(s), 4 exploit(s). Successful infection resulted in an average of 6 new process(es) on the target machine.

Malicious software is hosted on 3 domain(s), including servicescode.in/, frlabs.in/, imrays.in/.

This site was hosted on 1 network(s) including AS8560 (SCHLUND).

Unfortunately, those most likely to need the warnings are the least likely to understand and/or heed them. That UK site is one of those that usurps "usenet" newsgroups and presents them as their own "forums". I guess that's the way the story goes....