Sorted!
In order to remove the tank, you need to relieve the pressure following the guide below, then you can disconnect the fuel line. I couldn't access the back of the tank enough to get my hands in place to disconnect the fuel pump connector (3P), it was one of those awful Honda connectors that you have to press in several places to get it to come apart - no chance with the access I had. So I had a cup of tea to ponder things then decided I'd give it a try with the tank in place.
Holding the front up as high as I could with a piece of wood, I (very) carefully removed all the screws holding the airbox lid on. Not an easy task but taking it slowly I was able to undo them all and carefully remove them without dropping them (did that on my '98 many years ago) using a magnetic tool I have for that purpose. I was just able to move the top aside enough to remove the old air filter, squeeze in the new one and get the lid back on, but it was tight.
I then VERY gingerly and slowly lowered the screws back into place and tightened them up. Thanks Honda! NOT!