If you have access to a PC, you have access to LASORS:
http://www.caa.co.uk/lasors
I would add that if you have an IMC rating, this is valid for 25 months from the date of either your last IR or IMC renewal or revalidation. However, you MUST ask your examiner to sign the IMC
as well as the IR in your licence in order to get this entitlement.
You can REVALIDATE your IR up to 3 months prior to expiry with no loss of entitlement. e.g. If your rating is due to expire on the 10th December 2007 and you take your flight test on the 10th September 2007, your revalidated rating will remain valid until the 10th December 2008. However if you take your flight test on the 9th September 2007, your rating would only remain valid until the 8th September 2008.
In the above example, a flight test taken any time AFTER the 10th December 2007 would be classed as a RENEWAL, although the test profile is exactly the same. As stated by "portsharbourflyer", a flight test taken after the 10th of December 2011 (5 years from the last renewal / revalidation) would need to be conducted by a CAA staff examiner.
I, personally, would definately recommend a couple of hours with an instructor, especially if you plan on combining the test with a MEP renewal / revalidation. This would also serve to get you comfortable in the Left hand seat again.