I've never seen an MTB/hybrid at Weston but I've only ever really been there for the TTT events.
The whole setup at Weston is pretty relaxed so I'm certain that MTB/hybrid wouldn't be a problem though. The midweek series at Weston is on Tuesdays, no? There are also the Oxonian club TTs on Wednesdays, but they are on roads all around (west) Oxfordshire so may not always be so convenient.
I've never seen an MTB/hybrid at Weston but I've only ever really been there for the TTT events.
The whole setup at Weston is pretty relaxed so I'm certain that MTB/hybrid wouldn't be a problem though. The midweek series at Weston is on Tuesdays, no? There are also the Oxonian club TTs on Wednesdays, but they are on roads all around (west) Oxfordshire so may not always be so convenient.