Hi am considering a pretty long ride London to Bulgaria best part of 1800 miles each way obviously crossing a number of countries, using most likely a Pan European apart from the obvious and making sure the bike is road worthy any other info tips would be welcome. plan to travel as light as possible, but camping mostly. time is not an issue as probably looking to spend most if not all the summer doing it back end of September time. Leaving within a couple of weeks. Thanks

'Travelling as light as possible' and 'camping mostly', don't fit in the same sentence. I'd go for small B&Bs rather than lugging a huge amount of camping gear around easier, and much more comfy! The further east you go, the cheaper it will be. Try and check out the Transfaragasan in Romania - a great road to ride. The road surfaces very wildly in that area, and you'll need to watch yourself, especially on a Pan. Expect animals wandering about in the road etc. 
Some of the higher routes in Europe will currently be under a heall of a lot of snow, so you'll have to stay quite low in terms of altitude. 

It does sound like a memorable trip though - enjoy and good luck!                                                                                                                                                                             

Plenty of sandwiches and a big flask lol.  Good travel/Health Insurance                                                                                                                                                                                

Cheers Ian                                                                                                                                                                             

I can happily keep all of my camping equipment including tent in one 42 litre pannier with the exception of my sleeping bag which goes in the top box. The rest of the top box space is for purchases that day such as food etc.

Other pannier holds clothes, laptop etc. Tools in a tool tube mounted between pannier and bike. You do not need loads of kit to camp comfortably for extended periods, although I agree with Ian to an extent and do treat myself to a nice hotel every few days and make use of the facilities.

Most of the Alpine passes won't be open yet as already mentioned so you will have to plan accordingly.

Do make sure your travel insurance covers you properly as a lot say they do but then limit you to 125cc machines or something

The biggest tip for such a trip is don't worry, just do it. It will work out and you will have a fantastic time !!

nice one Pete cheers