Partly inspired by seeing a photo on FB of the X10 using Durham Road through Shipcote and seeing the current X10 displaying 'Bus Full' as it left Wolviston heading north yesterday evening, it got me thinking about Express Services of yesteryear.

Tried filling in the gaps, using my knowledge and memories. 
But if anyone can help a man out, it would be appreciated. 

X1 (Newcastle to Middlesbrough). Now ANE X12.
X2 (Sunderland to Bishop?). Doesn't exist. 
X3 (?) 
X4 (Newcastle to Sunderland). Partly replaced by GNE 56.
X5 (Newcastle to Hartlepool). Partly replaced by GNE X1
X6 (Langley Park to Sunderland). Doesn't exist.
X7/8 (Consett to Sunderland/Washington services?). Partly replaced by 8/78.
X9 (?)
X10 (Newcastle to Middlesbrough (now operates via A19). Was joint op. Now fully GNE.

There were a load of Expresses from various parts of Durham to Newcastle and Metrocentre for a period in the late 80s early 90s and were operated by a number of companies.
Ditto the ones from South Shields, such as the X22. But I'm sure they were in the VFM days. 

I can also remember the following, but unsure if they ran in the 80s. Or came after. 
X85 
X88
X89
X90
X94
X95/96

I vaguely remember some X90 'somethings' running to Whickham/Lobley Hill for a period too. 

Any help in filling in the blanks would be appreciated!