If all you want is a few megs to make a front page that will link to your forum which will stay where it is, then I can sort you out some space for about a quid a month.
Bear in mind though that a static front page wouldn't do anything for your Google rankings.. Google basis it's rankings on popularity, regularly updated content, page hits, links (and their relevance to the content) amongst a load of other things.. it helps to keep dead pages off the top of the searches, eventually all those mega old GeoCities sites which people set up yonks ago will disappear to page 5 million.
Personally what I'd do is activate the portal for your forum if possible (which software is it runing on? VB, IPB, PHPBB, SMF etc?) and then sign up to
http://www.123-reg.co.uk/
Once on there, buy a domain name you like and just set it up to redirect to your lengthy forum name. People can remember the website, you don't have to move anything or create anything.. easy peasy.
If you ever decide to get your own hosting, if you use
http://www.webfusion.co.uk/webhosting/ and go for the Pro package if your running a forum, then they are the sister site to 123-reg.. in your 123 panel, you type in your webfusion's IP and it sets it up for you, none of this nameserver 1 and 2 blah crap..
Also, if you buy your own domain name look into setting the email side of it up with google (they have specific 123-reg walkthrough for setting it up) You then have the advantage of using Google's Spam and Virus filters as well as being able to check your email away from home. Give me a shout if you want a hand setting that up
