Fullcapwearer.

I REALLY recommend the Autoglym.
As you're in the UK, you can get it in Halfords.
I always wait until they have a 3 for the price of 2 offer to buy it.
But you may just want to buy 1 at first to try it out.
If you only use ORWG on the front, then you'd only need to soak the front in a small bowl and it would be more economical for you.
Every other glue remover I've tried has always left some glue behind and they say that 1% residue of old glue equals 10% less bond on the next attachment.
Its about £6.50 a bottle.

Good luck.