Many thanks for your advice here. I can't get the engineer back as the company was made redundant more than a year ago.
When I type http://192.168.2.1 into my browser then press enter I get lots of web pages coming up? I have tried some of them and even got to where I needed to click on connection type etc; and I could see a password has been put in but is unreadable. However I'll keep trying.
I have wondered if I take my router back to it's original settings if it would let me put in a new password, but maybe not??.. A bit frightened incase I make a big mistake trying to do that.
Many thanks for your advise I appreciate it lots.